Woman priest, one on board (8)
I believe the answer is:
director
'one on board' is the definition.
(I've seen this before)
'woman priest' is the wordplay.
'woman' becomes 'di'.
'priest' becomes 'rector' (I've seen this before**).
'di'+'rector'='DIRECTOR'
(Other definitions for director that I've seen before include "Company board member" , "He makes films or runs companies" , "Boss posing as creditor" , "leader" , "Senior person in a firm, executive or non-executive" .)