How petals can change colour (6)

I believe the answer is:

pastel

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'change colour' is the definition.
'pastel' can be an answer for 'colour' (pastel is a kind of colour). I am not sure about the 'change' bit.

'how petals' is the wordplay.
'how' indicates an anagram (I've seen this in other clues).
'petals' with letters rearranged gives 'PASTEL'.

'can' is the link.

Can you help me to learn more?

(Other definitions for pastel that I've seen before include "pigments mixed with gum" , "Soft shade (of a colour)" , "Staple light colour" , "Outmoded" , "Crayon - pale colour" .)

I've seen this clue in the Evening Standard.

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