Mock the art set without frames and colour (5)
I believe the answer is:
ochre
'colour' is the definition.
(ochre is a kind of colour)
'mock the art set without frames' is the wordplay.
'mock the art' becomes 'och' (I am not sure about this - if you are sure you should believe this answer much more).
'set' becomes 'forest' (foresting is a kind of setting).
'without frames' says to take the centre (remove the edge letters which 'frame' the words).
The central letters of 'forest' are 're'.
'och'+'re'='OCHRE'
'and' is the link.
(Other definitions for ochre that I've seen before include "Yellowish-orange colour" , "Yellow-orange hue" , "Earthy colour" , "Orange" , "A shade" .)