Clowns seen here in large shirt (3,3)

I believe the answer is:

big top

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'clowns seen here' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'large shirt' is the wordplay.
'large' becomes 'big' (synonyms).
'shirt' becomes 'top'.
'big'+'top'='BIG TOP'

'in' is the link.

Can you help me to learn more?

(Other definitions for big top that I've seen before include "performance in The Ring" , "'Main circus tent (3,3)'" , "entertainment centre" , "needed by Mae West, for one?" , "Circus venue" .)

I've seen this clue in The Sun.

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