Puts up with two saints (6)
I believe the answer is:
stands
'puts up with' is the definition.
('stand' can be a synonym of 'put up with')
'two saints' is the wordplay.
'two saints' can mean two substitutions for 'saint'.
'saint' becomes 'st' (abbreviation).
'saint' becomes 'ands' (I am not sure about this - if you are sure you should believe this answer much more).
'st'+'ands'='STANDS'
Can you help me to learn more?
(Other definitions for stands that I've seen before include "Remains in force" , "Tiered seats in stadiums" , "In which to sit at football matches" , "Structures where people sit to watch, oddly" , "Assumes an upright position" .)