Emulate Picasso (5)
I believe the answer is:
paint
'emulate picasso' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for paint that I've seen before include "Colouring matter for decoration" , "Use a brush on canvas" , "A pint of liquid decoration" , "Coloured liquid in tins" , "Surface coating or decoration" .)