If red, does it take half an hour to get cool, maybe? (6)
I believe the answer is:
colour
'if red does it' is the definition.
I can't tell whether this defines the answer.
'half an hour to get cool maybe?' is the wordplay.
'half' suggests halving the letters.
'to get' means one lot of letters go next to another.
'maybe?' indicates anagramming the letters (I've seen 'maybe' mean this).
'hour' cut in half is 'ur'.
'cool' anagrammed gives 'colo'.
'ur' put after 'colo' is 'COLOUR'.
'take' acts as a link.
Can you help me to learn more?
(Other definitions for colour that I've seen before include "Quality that results from light reflection" , "Go red" , "Affect" , "See 10" , "Tinge - distort" .)