Crossword Genius

Airport employee becomes an army officer's personal servant (6)

Ross

I believe the answer is:

batman

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

'officer's personal servant' is the definition.
(I've seen this before)

'airport employee becomes an army' is the wordplay.
I cannot really understand how this works, but
'employee' could be 'man' and 'man' is present in the answer.
'an' could be 'a' and 'a' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for batman that I've seen before include "He helps the officer" , "'British military orderly, with Robin as a sidekick? (6)'" , "Officer's attendant" , "gives help to one in a mess?" , "Army servant - comic character" .)

I've seen this clue in The Guardian.
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