Foul shot? Rubbish (4)
I believe the answer is:
tosh
'rubbish' is the definition.
(I've seen this before)
'foul shot?' is the wordplay.
'foul' indicates anagramming the letters.
'shot' anagrammed gives 'TOSH'.
(Other definitions for tosh that I've seen before include "Scottish chum" , "13 [TRIPE]" , "moonshine" , "Nonsense; shot (anag.)" , "Hooey" .)