Fitting aid for a person crazy about flying? (4,3)
I believe the answer is:
wing nut
'crazy about flying?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'fitting aid for a person' is the wordplay.
'fitting aid for' becomes 'wing' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a person' becomes 'nut' (nut is a kind of person).
'wing'+'nut'='WING NUT'
Can you help me to learn more?
(Other definitions for wing nut that I've seen before include "Item with two flaps and a thread, tightened by hand" , "offering some security?" , "It turns easily" , "fixing device" , "Fastener with two flat lugs to aid tightening" .)