Across

1 Holds up picnic baskets (7) HAMPERS [double meaning]

5 Sort of drink set beside the driver (4,3) SODA CAN

9 A cart used to measure weight of gems? (5) CARAT [anagram of A CART]

10 I am like Peter Pan; incomparably so (9)

11 Do return debts to avoid causing hatred (6) ODIOUS [OD(do return) IOUS(debts)]

12 Feeble agent gets it after a month (8) DECREPIT [DEC(month) REP(agent) IT]

14 Train Diana in this country, away from prying eyes (5) INDIA [traIN DIAna]

15 The broadcast set up rare openings (9) APERTURES [anagram of SET UP RARE]

18 Valuable view of ducks (6,3) GOLDEN EYE

20 To transport goods back to a mall, a S. American animal may come in handy (5) LLAMA [anagram of A MALL]

22 Peer for a third of a sovereign on an English isle (8) NOBLEMAN

24 Before a congressman, broadcast signal was boosted and clarified by the device (6) PREAMP [PRE(before) A MP(congressman)]

26 Hill the counsellor — a most irritating individual (9) TORMENTOR [TOR(hill) MENTOR(counsellor)]

27 Drain to the bottom of an emotional state (5) NADIR [anagram of DRAIN]

28 Found her lost pistol case slung on a belt (7) HOLSTER [anagram of HER LOST]

29 Was afraid the red would run — dead worried (7) DREADED [anagram of RED DEAD]

Down

1 Bullying once right paradoxically (9) HECTORING [anagram of ONCE RIGHT]

2 Somehow impair their ride to the altar (7) MARRIED [MAR(impair) RIED(anagram of RIDE)]

3 Following — e.g. at Rouen possibly (9) ENTOURAGE[anagram of E.G. AT ROUEN]

4 Glide smoothly along (4) SURF

5 Illness one appears to recover from? (5,5)

6 Daughter back — dull and tedious (5) DREAR [D(daughter) REAR(back)]

7 No quick growing plant? (7) CREEPER [double meaning]

8 Receive stolen goods! (5)

13 Guy the agent is a lawbreaker (10) MALEFACTOR [MALE(guy) FACTOR(agent)]

16 It's clear Eton developed the liberal spirit (9) TOLERANCE [anagram of CLEAR ETON]

17 Alarmed about retired agent getting shot through (9) SCARPERED

19 Free translation of Braille (7) LIBERAL [anagram of BRAILLE]

21 Granted a guard for Edward (7) AWARDED [A WARD(guard) ED(Edward)]

22 A companion not first to score (5) NOTCH

23 Build, to set upright (5) ERECT

25 Gone for a loaf, we hear (4) BRED[ sounds like BREAD(loaf)]