Jargon I allow, having talked turkey first (12)
I believe the answer is:
gobbledegook
'jargon' is the definition.
(I've seen this in another clue)
'i allow having talked turkey first' is the wordplay.
I cannot really see how this works, but
'i' could be 'ego' ('I' in Latin) and 'ego' is present in the answer.
'allow' could be 'le' (I've seen this in other clues) and 'le' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for gobbledegook that I've seen before include "Unintelligible jargon" , "Unreadable jargon" , "incoherent speech" , "Load of tripe" , "pompous jargon" .)