Time is possibly no Hinduism forte! (6,9)
I believe the answer is:
fourth dimension
'time' is the definition.
('fourth dimension' can be a synonym of 'time')
'possibly no hinduism forte' is the wordplay.
'possibly' indicates an anagram.
'no'+'hinduism'+'forte'='nohinduismforte'
'nohinduismforte' is an anagram of 'FOURTH DIMENSION'.
'is' acts as a link.
(Other definitions for fourth dimension that I've seen before include "It may be described as time" , "feature of spacetime" .)