Coach's sports shoe (7)
I believe the answer is:
trainer
I believe this clue is a double definition.
'coach's' is the first definition.
(thesaurus)
'sports shoe' is the second definition.
(I've seen this before)
(Other definitions for trainer that I've seen before include "Casual 11 ac" , "Sports footwear" , "Coach - item of footwear" , "The odd thing an athlete may leave behind" , "Sports shoe" .)