Imagine this clue initially turning cryptic! (9)
I believe the answer is:
enigmatic
'cryptic' is the definition.
(both mean puzzling)
'imagine this clue initially turning' is the wordplay.
'initially' says to take the initial letters.
'turning' is an anagram indicator.
The initial letters of 'this clue' is 'tc'.
'imagine'+'tc'='imaginetc'
'imaginetc' is an anagram of 'ENIGMATIC'.
(Other definitions for enigmatic that I've seen before include "Cryptic, mysterious" , "Like a puzzle" , "Ambiguous or puzzling" , "with a mystery ingredient" , "Mysterious or puzzling, like Mona Lisa's smile" .)