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' means two substitutions for 'saint'.
'saint' becomes 'st' (abbreviation).
'saint' becomes 'ands' (I can't justify this - if you can 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" .)