Marine manoeuvres for fliers (6)
I believe the answer is:
airmen
'fliers' is the definition.
('airman' can be a synonym of 'flier')
'marine manoeuvres' is the wordplay.
'manoeuvres' indicates an anagram (letters manoeuvred in a new way).
'marine' with letters rearranged gives 'AIRMEN'.
'for' acts as a link.
(Other definitions for airmen that I've seen before include "they take off from the ground" , "members of the armed forces?" , "serving in HM forces?" , "Daedalus and Icarus for example" , "Male aviators" .)