Money artist left in the middle (7)
I believe the answer is:
central
'in the middle' is the definition.
(I've seen this before)
'money artist left' is the wordplay.
'money' becomes 'cent' (eg denomination of dollars).
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'left' becomes 'L' (common abbreviation).
'cent'+'ra'+'l'='CENTRAL'
(Other definitions for central that I've seen before include "Every answer here has one such letter" , "Middle; crucial" , "Focal" , "like this answer" , "Key" .)