Artist keeps French wine in acid mixture (2,5)
I believe the answer is:
da vinci
'artist' is the definition.
(I've seen this before)
'french wine in acid mixture' is the wordplay.
'french wine' becomes 'vin' ('wine' in French).
'in' indicates putting letters inside.
'mixture' is an anagram indicator.
'acid' with letters rearranged gives 'daci'.
'vin' going within 'daci' is 'DA VINCI'.
'keeps' is the link.
(Other definitions for da vinci that I've seen before include "Leonardo . . . painted the" , "Italian inventor artist" , "'Versatile genius of the Italian Renaissance (2,5)'" , "artist, scientist, and engineer" , "See 13 Down" .)