Theatre the French note is full (7)
I believe the answer is:
replete
'is full' is the definition.
('replete' can be a synonym of 'full')
'theatre the french note' is the wordplay.
'theatre' becomes 'rep' (I've seen this in other clues).
'the french' becomes 'le'.
'note' becomes 'te' (**).
'rep'+'le'+'te'='REPLETE'
(Other definitions for replete that I've seen before include "Full to capacity" , "Full, satiated" , "charged" , "Chock-a-block" , "Well-fed" .)