Crossword Genius

During Prohibition, wants whiskey in dark pen? (5,4)

Ross

I believe the answer is:

black swan

I'm a little stuck... Click here to teach me more about this clue!

'dark pen?' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'during prohibition wants whiskey' is the wordplay.
'during' means one lot of letters goes inside another.
'prohibition' becomes 'ban' (synonyms).
'wants' becomes 'lacks' ('lack' can be a synonym of 'want').
'whiskey' becomes 'W' (phonetic alphabet: alpha, bravo, charlie etc.).
'lacks'+'w'='lacksw'
'ban' placed around 'lacksw' is 'BLACK SWAN'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for black swan that I've seen before include "Australian native bird" , "Aquatic bird" , "Aussie swimmer" , "Australian winger" .)

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app