Catalogue is quite miserable, being somewhat reduced (7)
I believe the answer is:
itemise
'catalogue' is the definition.
(I've seen this before)
'quite miserable being somewhat reduced' is the wordplay.
'being somewhat reduced' indicates a hidden word.
'ITEMISE' can be found hidden inside 'quite miserable'.
'is' acts as a link.
(Other definitions for itemise that I've seen before include "Set down separately" , "break down" , "List each thing separately" , "Read off list of things one by one" , "make inventory" .)