Cobbler's concern (4)
I believe the answer is:
shoe
'cobbler's concern' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for shoe that I've seen before include "Trainer perhaps" , "Plate nailed to underside of horse's hoof" , "From which playing cards are dealt one at a time" , "Hose (anag)" , "trainer, for example" .)