Soothsayer's craft needing no introduction (6)
I believe the answer is:
oracle
'soothsayer's' is the definition.
(I've seen this in another clue)
'craft needing no introduction' is the wordplay.
'craft' becomes 'coracle' (coracle is a kind of craft).
'needing no introduction' means to remove the first letter.
'coracle' with its initial letter taken off is 'ORACLE'.
(Other definitions for oracle that I've seen before include "A famous one at Delphi" , "Bringer of divine revelation" , "Ancient Greek expounder of wisdom" , "Medium for prophecy" , "Holy place where a god was believed to give advice and prophecy" .)