Rubbish conceals hideout … for this creature? (6)
I believe the answer is:
rodent
'this creature?' is the definition.
(rodent is a kind of creature)
'rubbish conceals hideout' is the wordplay.
'rubbish' becomes 'rot' (I've seen this before).
'conceals' is an insertion indicator.
'hideout' becomes 'den' ('den' can be a synonym of 'hideout').
'rot' placed around 'den' is 'RODENT'.
'for' is the link.
(Other definitions for rodent that I've seen before include "Eg, mouse or rat" , "Eg, mouse, squirrel" , "Toothy mammal" , "A rat, for instance" , "Placental mammal having a single pair of incisor, 'gnawing', teeth" .)