Range of colourings allowed in meat paste (7)
I believe the answer is:
palette
'range of colourings' is the definition.
(eg a painter's palette)
'allowed in meat paste' is the wordplay.
'allowed' becomes 'let' (to let is to allow or permit).
'in' means one lot of letters goes inside another.
'meat paste' becomes 'pate' (I've seen this in another clue).
'let' inserted into 'pate' is 'PALETTE'.
(Other definitions for palette that I've seen before include "selection of colours" , "Artist's range of colour" , "Variety of tones" , "painting equipment" , "Range of colours - what artist mixes them on" .)