They could knock you on the head and throw you out (8)

I believe the answer is:

bouncers

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

(Other definitions for bouncers that I've seen before include "Night-club doormen and chucker-outs" , "Returning cheques maybe" , "deliveries" , "Chuckers-out" , "People prepared to deal with one if troublesome" .)

I've seen this clue in The Hindu.

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