Copy track, please (6,4)
I believe the answer is:
follow suit
'copy' is the definition.
(following suit is a kind of copying)
'track please' is the wordplay.
'track' becomes 'follow' (I've seen this in another clue).
'please' becomes 'suit' (I've seen this in another clue).
'follow'+'suit'='FOLLOW SUIT'
(Other definitions for follow suit that I've seen before include "go from club to club" , "Do as others do" , "in due course" , "Do the same as someone else" , "Be guided by corporation man" .)