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Stuck on last four - any help appreciated.
26d Head of Army say, lives with protection (5) A - - - -
31a Cruelly kills rabbits (5) - - S - S
36a Could be more than one BA guard flying on a short trial (9) G - A - - - T - - could it be GLADIATOR ?
37d Reading is one part of communication (3) I - -

31 gases

26 a eg is
37 uni (hidden)

The first one is AEGIS

Head of army A
Say EG
Lives IS

The last one is UNI - contained inside commUNIcation

36 gradu a tes

Thank you all very much - Happy New Year