Mother gets a guy and a colour (7)
I believe the answer is:
magenta
'a colour' is the definition.
(magenta is a shade of purple)
'mother gets a guy' is the wordplay.
'mother' becomes 'ma' (Ma is another word for mother or mum).
'gets' is an insertion indicator (gets can mean captures or absorbs).
'guy' becomes 'gent' (I've seen this in another clue).
'a'+'gent'='agent'
'ma' placed around 'agent' is 'MAGENTA'.
'and' is the link.
(Other definitions for magenta that I've seen before include "Light mauvish-crimson" , "Deep purplish red" , "Colourful" , "Bright purplish-red" , "French victory" .)