Corporation's quarterly report (5)
I believe the answer is:
sales
'corporation's quarterly report' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sales that I've seen before include "Cheap offer periods" , "Opportunities to sell" , "Periods when shops sell goods at discounted prices, bargain times" , "Income received for goods and services over a given period" , "Marketing" .)