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Hi, Managed to do 1128 but stuck on three connected ones on 1127
31d Demand that one cuts up tree L???C Logic?
36a Soldier trapped in bombed cellar acting defensively (8) A??????? (if Logic is correct for 31 the third letter is G)
33d Key function to gather one's support (8) M???T?I?

Thanks in advance

36 allergic? (anagram)

33 MAINTAIN

main is "key", "tan" is a trigonometric function (short for "tangent"), I inserted

31 Lilac

........so lilac? (I in CALL upwards?)

Thanks for such prompt replies!