Button it! A horny fellow's seen round monastery (6)
I believe the answer is:
ashram
'monastery' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I don't see?
'button it a horny fellow's seen round' is the wordplay.
'button it' becomes 'sh'.
'horny fellow' becomes 'ram' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'seen round' is an insertion indicator.
'a'+'ram'='aram'
'sh' going within 'aram' is 'ASHRAM'.
Can you help me to learn more?
(Other definitions for ashram that I've seen before include "Hindu religious retreat" , "Place for religious retreat (in India)" , "etreat" , "Hindu place of retreat" , "religious community" .)