Crossword Genius

Express plugs the most popular acts? (12)

Ross

I believe the answer is:

showstoppers

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'most popular acts?' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'express plugs' is the wordplay.
'express' becomes 'show' (synonyms).
'plugs' becomes 'stoppers' ('stopper' can be a synonym of 'plug').
'show'+'stoppers'='SHOWSTOPPERS'

'the' acts as a link.

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I've seen this clue in The Times.
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