Rugby club women as an afterthought (5)
I believe the answer is:
wasps
'rugby club' is the definition.
(I've seen this before)
'women as an afterthought' is the wordplay.
'women' becomes 'w'.
'an afterthought' becomes 'ps' (ps stands for postscript).
'w'+'as'+'ps'='WASPS'
(Other definitions for wasps that I've seen before include "English Protestant stingers?" , "Insects; rugby union team" , "Stinging hymenopterans" , "Rugby club" , "Striped stinging insects" .)