Filled theatre with rented audience in the end (7)
I believe the answer is:
'filled' is the definition.
(I've seen this in another clue)
'theatre with rented audience in the end' is the wordplay.
'theatre' becomes 'rep' (repertory theatre).
'with' means one lot of letters go next to another.
'rented' becomes 'let' (I've seen this in another clue).
'in the end' indicates one should take the final letters.
The final letter of 'audience' is 'e'.
(Other definitions for replete that I've seen before include "Filled, sated" , "Completely filled" , "Gorged, satiated" , "Full to capacity" , "Full, satiated" .)