1 Express gratitude in letter symbolically (6)
4 Acknowledgement of reflective snippet within retweet (7)
10 Good frost creates filth (5)
11 Mole perhaps forms burrow with both sides restricting echo (9)
12 Id est - it is confused i.e. most neat (7)
14 Transporters, clever when reversing (5)
15 Light emitting diode initially rewired in infra red is less active (5)
17 Aussie spoilsports express amazement at non-U junkies (7)
19 Old French black revolutionary hunter (5)
20 Can Saxon borders be this? (3)
21 Lines cast by angler who moves (5)
22 Political opponents imprison one French madam following good suggestion (7)
24 Incorporated America -- it helps to listen (5)
25 Country bumpkins in hickory thickets (5)
26 Score for Yankees from regular winner (4,3)
30 Consequently a draw is acceptable for this (2,1,6)
31 At 225o am I finding a guru? (5)
32 In dispute, an accumulation said to be in need of a blessing (2,5)
33 Drink Ian Kirk's squash (6)