Drawer where artist keeps gouache, primarily (6)
I believe the answer is:
magnet
'drawer' is the definition.
(I've seen this before)
'artist keeps gouache primarily' is the wordplay.
'artist' becomes 'manet' (I've seen this before).
'keeps' is an insertion indicator (inserted letters are kept inside).
'primarily' says to take the initial letters.
The initial letter of 'gouache' is 'g'.
'manet' placed around 'g' is 'MAGNET'.
'where' acts as a link.
(Other definitions for magnet that I've seen before include "Centre of attraction" , "Source of attraction" , "Attractor of iron" , "One that attracts" , "Device that attracts objects containing iron" .)