Lovely thing, solver? (7)
I believe the answer is:
cracker
I believe this is a double definition.
'lovely thing' is the first definition.
'solver?' is the second definition.
(someone who cracks things)
(Other definitions for cracker that I've seen before include "Bonbon" , "Thin crisp biscuit" , "it may be specially for Christmas" , "regularly featured at Christmas" , "Xmas table extra" .)