Obsession can be about right for an airman
I believe the answer is:
mania
'obsession' is the definition.
(I've seen this before)
'about right for an airman' is the wordplay.
I cannot really understand how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is found within the answer.
'an' could be 'i' (Roman numeral for one) and 'i' is found within the answer.
The remaining letters 'mna' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'can be' acts as a link.
Can you help me to learn more?
(Other definitions for mania that I've seen before include "Aberration" , "Excessive enthusiasm" , "wildness" , "Passion -- mood disorder" , "Violent madness or extreme enthusiasm" .)