The outskirts of Dyfed are hardly colourless (4)
I believe the answer is:
dyed
'hardly colourless' is the definition.
I can't tell whether this definition defines the answer.
'the outskirts of dyfed' is the wordplay.
'the outskirts of' suggests removing the centre (only letters on the outskirts).
'dyfed' with its middle taken out is 'DYED'.
'are' acts as a link.
Can you help me to learn more?
(Other definitions for dyed that I've seen before include "Coloured by dipping in liquid" , "Stained with a new colour" , "Tinted" , "Cloth is often" , "not natural?" .)