Bear up when there’s a suspension (4)
I believe the answer is:
stay
This clue is a double definition.
'bear up' is the first definition.
(thesaurus)
'there's a suspension' is the second definition.
(I've seen this in other clues)
'when' acts as a link.
(Other definitions for stay that I've seen before include "Reside" , "Corset strut" , "Sojourn" , "Remain; detain" , "control" .)