A little move by a militant to the left, perhaps? (5)
I believe the answer is:
maybe
'perhaps?' is the definition.
('maybe' can be a synonym of 'perhaps')
'a little move by a militant to the left' is the wordplay.
'a little' says the answer is hidden in the clue.
'to the left' says the letters should be written backwards (reading from right to left).
'ebyam' is hidden in the letters of 'move by a militant'.
'ebyam' reversed gives 'MAYBE'.
(Other definitions for maybe that I've seen before include "Perhaps, might happen" , "Perhaps, possibly" .)