Wad (4)
'wad' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for lump that I've seen before include "Chunk, clod, nodule" , "Large piece without definite shape" , "Irregularly shaped piece" , "Small solid mass" , "Small shapeless mass" .)
'wad' is the definition.
(synonyms)
This is all the clue.
(Other definitions for bundle that I've seen before include "Things tied together" , "Loosely bound pile" , "Swag for Australian" , "Batch" , "A third of a quarter" .)