Time to turn priest into racing expert (7)
I believe the answer is:
tipster
'racing expert' is the definition.
'tipster' can be an answer for 'expert' (tipster is a kind of expert). I am not sure about the 'racing' bit.
'time to turn priest' is the wordplay.
'time' becomes 't' (abbreviation).
'to turn' indicates anagramming the letters.
'priest' anagrammed gives 'ipster'.
't'+'ipster'='TIPSTER'
'into' acts as a link.
Can you help me to learn more?
(Other definitions for tipster that I've seen before include "Race winner forecaster" , "One who sells betting advice" , "Supposed expert on horses" , "One providing betting hints" , "Adviser on betting" .)