Keeps down bears (8)
I believe the answer is:
stomachs
This clue could be a double definition.
'keeps down' is the first definition.
Although both the answer and definition are verbs in their -s form, I don't see how one could define the other.
'bears' is the second definition.
('stomach' can be a synonym of 'bear')
Can you help me to learn more?
(Other definitions for stomachs that I've seen before include "Four of these for bulls" , "They connect the oesophagus to the small intestine" , "bibles, for example" , "Endures or tolerates - in abdomen?" , "Tummies" .)