Rhetorical phrase from best man, say (6,2,6)
I believe the answer is:
figure of speech
'rhetorical phrase' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'from best man say' is the wordplay.
I cannot really understand how this works, but
'from' could be 'of' (of can mean from or belonging to) and 'of' is present in the answer.
'man' could be 'r' (abbreviation for rook, a chess piece or 'man') and 'r' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for figure of speech that I've seen before include "Eg, hyperbole" , "rhetorical feature - with 16d" , "Politician's quoted statistic" , "Oxymoron is" , "striking phrase" .)