Enigma I somehow fancy (7)
I believe the answer is:
imagine
'fancy' is the definition.
(I know that fancy is a kind of imagine)
'enigma i somehow' is the wordplay.
'somehow' is an anagram indicator.
'enigma'+'i'='enigmai'
'enigmai' is an anagram of 'IMAGINE'.
(Other definitions for imagine that I've seen before include "Fancy - dream" , "Believe to be so, suppose" , "See something that doesn't exist" , "Devise" , "Number one" .)