Saint who may be warned off (6)
I believe the answer is:
andrew
'saint who' is the definition.
'andrew' can be an answer for 'saint' (St Andrew is an example). I'm not sure about the rest of the definition.
'warned off' is the wordplay.
'off' is an anagram indicator.
'warned' is an anagram of 'ANDREW'.
'may be' acts as a link.
Can you help me to learn more?
(Other definitions for andrew that I've seen before include "Boy's name" , "Composer of many musicals ..." , "Peter's brother" , "Wander (anag)" , "- Motion, Poet Laureate" .)