Airhead male wears baby-wear on face (5)
I believe the answer is:
bimbo
'airhead' is the definition.
(both can mean a stupid person)
'male wears baby-wear on face' is the wordplay.
'male' becomes 'm' (common abbreviation).
'wears' is an insertion indicator.
'baby wear' becomes 'bib' (I've seen this in another clue).
'face' suggests taking the first letters.
The initial letter of 'on' is 'o'.
'm' put inside 'bib' is 'bimb'.
'bimb'+'o'='BIMBO'
(Other definitions for bimbo that I've seen before include "floozie?" , "Scornful slang term for attractive but unintelligent young woman" , "Attractive but vacant young woman" , "empty cracker?" , "Attractive but empty-headed young female" .)