Colour apt to mount on one side of the face (6)
I believe the answer is:
cerise
'colour' is the definition.
(cerise is a kind of colour)
'mount on one side of the face' is the wordplay.
'mount' becomes 'rise' (synonyms).
'on' is a charade indicator (letters next to each other).
'one side of' means to take half the letters.
'face' cut in half is 'ce'.
'rise' after 'ce' is 'CERISE'.
'apt to' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for cerise that I've seen before include "Reddish-pink colour" , "Color of ripe cherries" , "Pinkish-red" , "Cherry red colour" , "Pinkish red" .)