Assist in catching bird: loon? (7)
I believe the answer is:
airhead
'loon?' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I don't see?
'assist in catching bird' is the wordplay.
I cannot quite see how this works, but
'bird' could be 'rhea' (rhea is a kind of bird) and 'rhea' is found in the answer.
'assist' could be 'aid' (synonyms) and 'aid' is found within the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for airhead that I've seen before include "Dope" , "Idiot" , "Fool" , "Simple-minded soul" , "One's simple" .)