Petals can have such shades (6)

I believe the answer is:

pastel

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'such shades' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'petals can' is the wordplay.
'can' is an anagram indicator (I've seen 'canned' mean this (canned can mean drunk)).
'petals' is an anagram of 'PASTEL'.

'have' acts as a link.

Can you help me to learn more?

(Other definitions for pastel that I've seen before include "Outmoded" , "Crayon - pale colour" , "Staple (anag)" , "Crayon - of soft shades" , "art work" .)

I've seen this clue in the Evening Standard.

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