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Outdid frames art gallery trialled (4-6)

Ross

I believe the answer is:

beta-tested

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'trialled' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs occasionally define each other.

'outdid frames art gallery' is the wordplay.
'outdid' becomes 'bested' ('best' can be a synonym of 'outdo').
'frames' is an insertion indicator.
'art gallery' becomes 'tate' (Tate Modern, Tate Britain etc).
'bested' enclosing 'tate' is 'BETA-TESTED'.

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I've seen this clue in The Guardian.
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