Astounded in leaving stand-up comedian accommodating the scouts (4)

I believe the answer is:

camp

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'astounded in leaving stand' is the definition.
'camp' can be an answer for 'stand' (thesaurus). I'm unsure of the 'astounded in leaving' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for camp that I've seen before include "Bivouac, group of tents" , "Live in a tent" , "party supporters" , "Holiday -; - follower" , "Tent site" .)

I've seen this clue in the Irish Times.

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