Large shapeless lump (6)
I believe the answer is:
dollop
'large shapeless lump' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for dollop that I've seen before include "Shapeless lump (of food)" , "Large shapeless lump" , "Shapeless mass or lump" , "Squidgy lump (of food)" , "Semisolid lump" .)