Curiosity in some way enters into it (8)
I believe the answer is:
interest
'curiosity' is the definition.
(interest is a kind of curiosity)
'some way enters into it' is the wordplay.
'some way' indicates an anagram.
'into' means one lot of letters goes inside another.
'enters' is an anagram of 'nteres'.
'nteres' going into 'it' is 'INTEREST'.
'in' acts as a link.
(Other definitions for interest that I've seen before include "Deposit account gain" , "Benefit" , "Fascinate" , "Proceeds" , "Principal" .)