English painter left with Sibyl? (8)
I believe the answer is:
landseer
'english painter' is the definition.
(I've seen this before)
'left with sibyl?' is the wordplay.
'left' becomes 'land' (I can't justify this - if you can you should give a lot more credence to this answer).
'with' is a charade indicator (letters next to each other).
'sibyl?' becomes 'seer' (sibyl is a kind of seer).
'land'+'seer'='LANDSEER'
Can you help me to learn more?
(Other definitions for landseer that I've seen before include "Dan reels about the painter" , "The Monarch of the_Glen painter" , "Victorian animal painter" , "He painted" , "Artist" .)