Nothing in copse to show track (6)
I believe the answer is:
groove
'track' is the definition.
(thesaurus)
'nothing in copse' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'in' means one lot of letters goes inside another.
'copse' becomes 'grove' (I've seen this in another clue).
'o' going into 'grove' is 'GROOVE'.
'to show' is the link.
(Other definitions for groove that I've seen before include "Long thin channel in surface of hard material" , "have the best time" , "Trendy" , "Long shallow indentation" , "Cutting" .)