Joined in something nice (3)
I believe the answer is:
met
'joined' is the definition.
(meeting is a kind of joining)
'in something nice' is the wordplay.
'in' says the answer is hidden in the clue.
'MET' is hidden in the letters of 'something nice'.
(Other definitions for met that I've seen before include "Bumped into" , "Came across - police in London" , "London police (abbr) - New York Museum of Art (abbr)" , "satisfied" , "Made a connection" .)