Silly person gets a lump (4)
I believe the answer is:
clot
I believe this clue is a double definition.
'silly person' is the first definition.
'a lump' is the second definition.
(thesaurus)
'gets' acts as a link.
(Other definitions for clot that I've seen before include "3 [DUMMY]" , "(Of blood) solidify" , "Clumsy person" , "Coagulate - fool" , "Twit; blood problem" .)