Unfortunately related to bore (9)
I believe the answer is:
tolerated
'bore' is the definition.
('tolerate' can be a synonym of 'bear')
'unfortunately related to' is the wordplay.
'unfortunately' is an anagram indicator (a bad or unfortunate spelling).
'related'+'to'='relatedto'
'relatedto' with letters rearranged gives 'TOLERATED'.
(Other definitions for tolerated that I've seen before include "Borne" , "Countenanced" , "Endured; allowed" , "Bore" , "Put up with" .)