Talked of having a pancake for the grand finale (7)
I believe the answer is:
waffled
'talked of' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Perhaps there's a link between them I don't understand?
'a pancake for the grand finale' is the wordplay.
'a pancake' becomes 'waffle' (I've seen this before).
'for' is a charade indicator (letters next to each other).
'the grand finale' becomes 'd' (I can't justify this - if you can you should give a lot more credence to this answer).
'waffle'+'d'='WAFFLED'
'having' is the link.
Can you help me to learn more?
(Another definition for waffled that I've seen is " Vacillated".)