Prop in second team (5)
I believe the answer is:
screw
'prop' is the definition.
(thesaurus)
'second team' is the wordplay.
'second' becomes 's' (common abbreviation).
'team' becomes 'crew' (crew is a kind of team).
's'+'crew'='SCREW'
'in' acts as a link.
(Other definitions for screw that I've seen before include "Kind of nail with spiral groove (5)" , "Hack" , "Prison officer (sl.)" , "swerve" , "Helical thread" .)