Action about night flier may be discussed (7)
I believe the answer is:
debated
'be discussed' is the definition.
(I've seen this before)
'action about night flier' is the wordplay.
'action' becomes 'deed' (deed is a kind of action).
'about' indicates putting letters inside.
'night flier' becomes 'bat' (I've seen this in another clue).
'deed' enclosing 'bat' is 'DEBATED'.
'may' is the link.
(Other definitions for debated that I've seen before include "Considered" , "Discussed formally" , "Contemplated" , "Argued" , "Shared opinions" .)