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It can be cool, half an hour in the shade (6)

Ross

I believe the answer is:

colour

I'm a little stuck... Click here to teach me more about this clue!

'the shade' is the definition.
(I've seen this before)

'it can be cool half an hour in' is the wordplay.
'it' becomes 'u' (I can't justify this - if you can you should believe this answer much more).
'can be' is an anagram indicator.
'half' indicates taking half.
'an hour' becomes 'hr' ('hr' can be a synonym of 'hour').
'in' means one lot of letters goes inside another.
'hr' cut in half is 'r'.
'cool' anagrammed gives 'colo'.
'colo'+'r'='color'
'u' put within 'color' is 'COLOUR'.

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" , "Influence" , "Pigment, paint or dye" , "Complexion - pretext" .)

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