Tolerate being tender in hospital department (5)
I believe the answer is:
abide
'tolerate' is the definition.
('abide' can be a synonym of 'tolerate')
'tender in hospital department' is the wordplay.
'tender' becomes 'bid' ('bid' can be a synonym of 'tender').
'in' means one lot of letters goes inside another.
'hospital department' becomes 'ae' (A&E, Accident & Emergency).
'bid' inserted into 'ae' is 'ABIDE'.
'being' is the link.
(Other definitions for abide that I've seen before include "Stay - suffer" , "Bear, endure" , "Endure; dwell" , "Hack" , "Remain - tolerate" .)