Place in old French art for murderer in mythology (7)
I believe the answer is:
orestes
'murderer in mythology' is the definition.
The definition suggests a singular noun which matches the answer.
'place in old french art' is the wordplay.
'place' becomes 'rest' (resting is a kind of placing).
'in' is an insertion indicator.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'french art' becomes 'es' ('is' in French - 'art' can mean 'is' eg 'thou art').
'o'+'es'='oes'
'rest' placed inside 'oes' is 'ORESTES'.
'for' is the link.
Can you help me to learn more?
(Other definitions for orestes that I've seen before include "Tragically, killer" , "Mythological Greek" , "One who took vengeance" , "Killer of mother" , "figure in Greek tragedy" .)