Changing role within board is bearable (9)
I believe the answer is:
tolerable
'bearable' is the definition.
('tolerable' can be similar in meaning to 'bearable')
'changing role within board' is the wordplay.
'changing' indicates anagramming the letters.
'within' is an insertion indicator.
'board' becomes 'table' ('table' can be a synonym of 'board').
'role' anagrammed gives 'oler'.
'oler' inserted into 'table' is 'TOLERABLE'.
'is' acts as a link.
(Other definitions for tolerable that I've seen before include "Fairly good" , "may be accepted?" , "Fair" , "Bearable" , "Acceptable" .)