Pages bearing ring for groom (5)
I believe the answer is:
primp
'for groom' is the definition.
(I've seen this before)
'pages bearing ring' is the wordplay.
'pages' becomes 'pp' (abbreviation for multiple pages).
'bearing' is an insertion indicator.
'ring' becomes 'rim' (rim is a kind of ring).
'pp' placed around 'rim' is 'PRIMP'.
(Other definitions for primp that I've seen before include "Tidy" , "Smarten up" , "Titivate one's appearance" , "Make minor changes to one's appearance" , "Make small adjustments to one's appearance" .)