Time to get exceptional priest, one to offer advice (7)
I believe the answer is:
tipster
'one to offer advice' is the definition.
(tipsters provide tips or advice)
'time to get exceptional priest' is the wordplay.
'time' becomes 't' (abbreviation).
'to get' means one lot of letters goes inside another.
'exceptional' indicates an anagram (an unusual or exceptional ordering of the letters).
'priest' is an anagram of 'tipser'.
't' placed within 'tipser' is 'TIPSTER'.
(Other definitions for tipster that I've seen before include "better counsellor" , "Racing tout" , "Person offering advice" , "One providing betting hints" , "One who sells betting advice" .)