Theatrical company rented playhouse, finally full (7)
I believe the answer is:
replete
'full' is the definition.
('replete' can be a synonym of 'full')
'theatrical company rented playhouse finally' is the wordplay.
'theatrical company' becomes 'rep' (short for repertory theatre).
'rented' becomes 'let' (I've seen this before).
'finally' indicates one should take the final letters.
The last letter of 'playhouse' is 'e'.
'rep'+'let'+'e'='REPLETE'
(Other definitions for replete that I've seen before include "Filled to satiety" , "Full, satiated" , "Fully satisfied" , "Sated by food" , "Well stocked or gorged" .)