Drop bowled toss (4)
I believe the answer is:
blob
'drop' is the definition.
(thesaurus)
'bowled toss' is the wordplay.
'bowled' becomes 'b' (cricket abbreviation).
'toss' becomes 'lob' (I've seen this before).
'b'+'lob'='BLOB'
(Other definitions for blob that I've seen before include "Indeterminate mass" , "Drop of thick liquid or viscous substance" , "Mark signifying nothing" , "Indeterminate drop of liquid" , "Indistinct shape" .)