Marine fliers? (6)

I believe the answer is:

airmen

I'm a little stuck... Click here to teach me more about this clue!

'fliers?' is the definition.
('airman' can be a synonym of 'flier')

'marine' is the wordplay.
'marine' can be anagrammed to 'AIRMEN'.
Though, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for airmen that I've seen before include "Marine (anag)" , "Daedalus and Icarus for example" , "Those flying" , "Male aviators" , "Red Arrows" .)

I've seen this clue in the Evening Standard.

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