Comprehensive review of cellarage after investment of shilling (5-5)
I believe the answer is:
large-scale
'comprehensive' is the definition.
(on a large or comprehensive scale)
'review of cellarage after investment of shilling' is the wordplay.
'review of' is an anagram indicator.
'after investment of' means one lot of letters goes inside another (inserted letters are invested).
'shilling' becomes 's'.
'cellarage' anagrammed gives 'largecale'.
'largecale' placed around 's' is 'LARGE-SCALE'.
(Other definitions for large-scale that I've seen before include "Wide-ranging" , "Extensive" .)