Put pen to paper, did you say? That’s correct (5)
I believe the answer is:
right
'correct' is the definition.
(synonyms)
'put pen to paper did you say?' is the wordplay.
'put pen to paper' becomes 'write' (I've seen this before).
'did you say?' indicates a 'sounds like' (homophone) clue.
'write' is a homophone of 'RIGHT'.
'that's' acts as a link.
(Other definitions for right that I've seen before include "True - just claim" , "Factual" , "Correct - starboard" , "Sound" , "Correct; entitlement" .)