Lay assembly? (3,5)
I believe the answer is:
hen party
'lay assembly?' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Maybe you can see a link between them that I don't see?
This is all the clue.
Can you help me to learn more?
(Other definitions for hen party that I've seen before include "Women's gathering (colloq.)" , "do for prospective union member" , "pre-wedding bash" , "A social gathering confined to women" , "Event to which stags are not invited" .)