Over in toilet are lots holding stomach? (8)
I believe the answer is:
tolerate
'stomach?' is the definition.
('tolerate' can be a synonym of 'stomach')
'over in toilet are lots' is the wordplay.
'over' says the letters should be written in reverse.
'in' indicates the answer is hidden within the clue.
'etarelot' is hidden within 'toilet are lots'.
'etarelot' backwards is 'TOLERATE'.
'holding' is the link.
(Other definitions for tolerate that I've seen before include "Endure with forbearance" , "Be indulgent" , "Stand" , "Put up with something or somebody" , "Brook" .)