Held in stomach in exiting contraption (7)

I believe the answer is:

machine

'contraption' is the definition.
(thesaurus)

'held in stomach in exiting' is the wordplay.
'held in' says the answer is hidden in the clue.
'MACHINE' is hidden within 'stomach in exiting'.

(Other definitions for machine that I've seen before include "Mechanical contrivance; engine" , "Mechanical or electrical device" , "Apparatus to perform a specific function" , "Device for work" , "Automaton" .)

I've seen this clue in The Telegraph.

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