Acts like a gobstopper (5)
I believe the answer is:
lasts
(Other definitions for lasts that I've seen before include "Holds out" , "Goes on" , "Keeps on" , "Cobblers' tools" , "carries on" .)
I believe the answer is:
lasts
(Other definitions for lasts that I've seen before include "Holds out" , "Goes on" , "Keeps on" , "Cobblers' tools" , "carries on" .)