Below a den, hunter shot (10)
I believe the answer is:
underneath
'below' is the definition.
(synonyms)
'a den hunter shot' is the wordplay.
'shot' indicates anagramming the letters.
'a'+'den'+'hunter'='adenhunter'
'adenhunter' anagrammed gives 'UNDERNEATH'.
(Other definitions for underneath that I've seen before include "on the hidden side" , "bottom" , "Lower" .)