Foul goalkeeper? More or less (7)
I believe the answer is:
noisome
'foul' is the definition.
(I know that foul can be written as noisome)
'goalkeeper? more or less' is the wordplay.
'goalkeeper?' becomes 'noi' (resembles No. 1, goalkeeper's shirt number).
'more or less' becomes 'some' (synonyms).
'noi'+'some'='NOISOME'
(Other definitions for noisome that I've seen before include "terribly unpleasant" , "Disgusting to sight or smell" , "Obnoxious" , "Smelling bad" , "Offensively smelling" .)