Wise errand to get prophet (4)
I believe the answer is:
seer
'prophet' is the definition.
(both can mean someone who tells the future)
'wise errand to get' is the wordplay.
'to get' indicates a hidden word (I've seen 'got' mean this).
'SEER' is hidden within 'wise errand'.
(Other definitions for seer that I've seen before include "Sage with 20ac" , "Sibyl" , "wise fellow" , "Oracle or clairvoyant" , "One divines the future" .)