Sale for running shoes (7)
I believe the answer is:
loafers
'shoes' is the definition.
(Loafer is an example)
'sale for running' is the wordplay.
'running' indicates an anagram.
'sale'+'for'='salefor'
'salefor' is an anagram of 'LOAFERS'.
(Other definitions for loafers that I've seen before include "couch potatoes" , "Comfortable shoes" , "They add cargo" , "Casual shoes" , "Casual footwear" .)