Chewed bagel and said he didn't give a damn, frankly (5)
I believe the answer is:
gable
'said he didn't give a damn frankly' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'chewed bagel' is the wordplay.
'chewed' indicates an anagram.
'bagel' with letters rearranged gives 'GABLE'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for gable that I've seen before include "American film star, d. 1960" , "Part of house" , "Part of wall in angle of pitched roof" , "Roof structure" , "US actor" .)