Hold in stomach (4)
I believe the answer is:
bear
I believe this is a double definition.
'hold' is the first definition.
('bear' can be a synonym of 'hold')
'stomach' is the second definition.
('bear' can be a synonym of 'stomach')
'in' acts as a link.
(Other definitions for bear that I've seen before include "Ursine animal" , "someone being ill-mannered" , "Support; share seller" , "rude fellow" , "Support; brutish person" .)