They buzz around in rugby shirts (5)
I believe the answer is:
wasps
'they' is the definition.
Both the answer and definition are plural nouns.
Maybe there's an association between them I don't understand?
'buzz around in rugby shirts' is the wordplay.
'buzz' becomes 'crew cut' (I've seen this in another clue).
'around' says to take the centre.
'in rugby shirts' becomes 'asps' (I can't justify this - if you can you should give a lot more credence to this answer).
The middle of 'crewcut' is 'w'.
'w'+'asps'='WASPS'
Can you help me to learn more?
(Other definitions for wasps that I've seen before include "Rugby club" , "Stinging hymenopterans" , "Insects; rugby union team" , "Members of rugby team" , "Striped stinging insects" .)