Does, stupidly, clown about and you suspend activities (5,4)

I believe the answer is:

close down

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But I can't explain it at all! Could you help me understand?

(Other definitions for close down that I've seen before include "stop broadcasting" , "Shut completely, cease working" , "put to bed" , "Shut up shop" , "end of it" .)

I've seen this clue in the Evening Standard.

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