Crossword Genius

Airport staff dreadfully rude? Wrong, when keeping cool head (6,4)

Ross

I believe the answer is:

ground crew

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

'dreadfully rude? wrong when keeping cool head' is the definition.
I can't judge whether this defines the answer.

'airport staff' is the wordplay.
'airport' becomes 'ground' (I can't justify this - if you can you should believe this answer much more).
'staff' becomes 'crew' (I've seen this before).
'ground'+'crew'='GROUND CREW'

Can you help me to learn more?

(Other definitions for ground crew that I've seen before include "Maintenance men" , "Team of mechanics" .)

I've seen this clue in The Independent.
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