Withdrawn hint is mine (3)
I believe the answer is:
pit
'is mine' is the definition.
(down the pit)
'withdrawn hint' is the wordplay.
'withdrawn' is a reversal indicator.
'hint' becomes 'tip' (synonyms).
'tip' reversed gives 'PIT'.
(Other definitions for pit that I've seen before include "Where the orchestra sits at an opera" , "Coalmine" , "Where the orchestra sits to accompany performers" , "Large hole; mine" , "Portland stone" .)