Start to show to some advantage (6)

I believe the answer is:

setoff

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

'start' is the definition.
(thesaurus)

'to show to some advantage' is the wordplay.
I cannot really see how this works, but
'to' is within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for setoff that I've seen is " Display - mount - start journey".)

I've seen this clue in The Irish Independent.

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