Bishop doesn’t have pale or dark pen, perhaps? (5,4)
I believe the answer is:
black swan
'dark pen perhaps?' is the definition.
I can't tell whether this defines the answer.
'bishop doesn't have pale' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'doesn't have' becomes 'lacks' (lacking something means not having it).
'pale' becomes 'wan' (wan can mean pale or grey).
'b'+'lacks'+'wan'='BLACK SWAN'
'or' acts as a link.
Can you help me to learn more?
(Other definitions for black swan that I've seen before include "Aquatic bird" , "Australian native bird" , "Aussie swimmer" , "Australian winger" .)