Graduate incorporating representative colour (7)
I believe the answer is:
magenta
'colour' is the definition.
(magenta is a shade of purple)
'graduate incorporating representative' is the wordplay.
'graduate' becomes 'MA' (abbreviation for Master of Arts).
'incorporating' indicates putting letters inside.
'representative' becomes 'agent' (agent is a kind of representative).
'ma' placed around 'agent' is 'MAGENTA'.
(Other definitions for magenta that I've seen before include "Colour named after a bloody 1859 battle in Italy" , "Shade of purple" , "A crimson dye" , "Reddish purple" , "Bright purplish-red" .)