Gets sex in centre wearing pair of smalls (6)
I believe the answer is:
scores
'pair of smalls' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'gets sex in centre wearing' is the wordplay.
'gets sex in' becomes 'ss' (I can't justify this - if you can you should give a lot more credence to this answer).
'centre' becomes 'core' (core can mean something's centre).
'wearing' is an insertion indicator.
'ss' placed around 'core' is 'SCORES'.
Can you help me to learn more?
(Other definitions for scores that I've seen before include "Written forms of musical compositions" , "Marks; is successful" , "Gains game points" , "Obtains marks, say" , "Scratches" .)