Greengrocer gleefully backing some old master (2,5)
I believe the answer is:
el greco
'master' is the definition.
(I know that El Greco is a old master)
'greengrocer gleefully backing some' is the wordplay.
'some' indicates the answer is hidden within the clue.
'backing' shows that the letters should be reversed in order.
'ocergle' can be found hidden inside 'greengrocer gleefully'.
'ocergle' back-to-front is 'EL GRECO'.
'old' acts as a link.
This may not be correct. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for el greco that I've seen before include "Spanish Renaissance painter" , "Domenikos Theotokopoulos" , "Sp. painter, born Domen- ikos Theotokopoulos" , "Sixteenth to seventeenth century Greek-born Spanish painter" , "Spanish painter born in Greece" .)