More than one blended harmoniously (5)

I believe the answer is:

toned

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'blended harmoniously' is the definition.
The answer and definition can be both related to change as well as being past participle verbs.
Maybe you can see an association between them that I can't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for toned that I've seen before include "Braced" , "Well-muscled" , "Noted (anag.)" , "In good condition (of muscles or skin)" , "Slightly tinted; firm-muscled" .)

I've seen this clue in the Evening Standard.

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