Dinar hit bottom (5)
I believe the answer is:
nadir
'bottom' is the definition.
(I've seen this before)
'dinar hit' is the wordplay.
'hit' indicates an anagram.
'dinar' anagrammed gives 'NADIR'.
(Other definitions for nadir that I've seen before include "extremely low position" , "Floor of drain in need of repair" , "Dinar (anag.)" , "most unsuccessful point" , "Very bottom, farthest from zenith" .)