Distributed on all pitches, but not uniform (5,7)
I believe the answer is:
plain clothes
'not uniform' is the definition.
'distributed on all pitches' is the wordplay.
'distributed' indicates anagramming the letters.
'on'+'all'+'pitches'='onallpitches'
'onallpitches' anagrammed gives 'PLAIN-CLOTHES'.
'but' acts as a link.
(Other definitions for plain clothes that I've seen before include "Act of bringing together (sides in dispute)" , "uniform? Wrong" , "Ordinary attire" , "sort of detective" , "Policeman's non-uniform wear" .)