Page, disconcerted, having chattered (8)
I believe the answer is:
prattled
'chattered' is the definition.
('prattle' can be a synonym of 'chatter')
'page disconcerted' is the wordplay.
'page' becomes 'p'.
'disconcerted' becomes 'rattled' (I've seen this before).
'p'+'rattled'='PRATTLED'
'having' is the link.
(Other definitions for prattled that I've seen before include "Wittered on" , "Chattered" .)