Forest where you might catch large cat? (5)
I believe the answer is:
taiga
'forest' is the definition.
(type of forest)
'where you might catch large cat?' is the wordplay.
'where you might catch' shows a homophone (sound like) (catch can mean to hear).
'large cat?' becomes 'tiger' (tigers are big cats).
'tiger' sounds like 'TAIGA'.
(Other definitions for taiga that I've seen before include "Forested northern land" , "swampy forests" , "tree-covered region" , "Swampy Siberian forest" , "Boggy forest" .)