Fairish new role accepted by board (9)
I believe the answer is:
tolerable
'fairish' is the definition.
(thesaurus)
'new role accepted by board' is the wordplay.
'new' is an anagram indicator.
'accepted by' means one lot of letters goes inside another.
'board' becomes 'table' ('table' can be a synonym of 'board').
'role' is an anagram of 'oler'.
'oler' placed into 'table' is 'TOLERABLE'.
(Other definitions for tolerable that I've seen before include "Fair" , "Mediocre" , "Passable" , "Fairly good" , "may be accepted?" .)