Disparage cricket score, reduced (3,4)
I believe the answer is:
run down
'disparage' is the definition.
(thesaurus)
'cricket score reduced' is the wordplay.
'cricket score' becomes 'run' (runs are scored in cricket).
'reduced' becomes 'down'.
'run'+'down'='RUN-DOWN'
(Other definitions for run down that I've seen before include "Worn-out" , "Cut back on" , "hit by a vehicle" , "not very well" , "criticised?" .)