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Won't you primarily sing this at sea? (6)

Ross

I believe the answer is:

shanty

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'sing this at sea?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'won't you primarily' is the wordplay.
'won't' becomes 'shan't' (I've seen this in another clue).
'primarily' suggests taking the first letters.
The first letter of 'you' is 'y'.
'shant'+'y'='SHANTY'

Can you help me to learn more?

(Other definitions for shanty that I've seen before include "folk song" , "Sailor's song or derelict building" , "Sea song - hovel" , "Small crude shelter and sailor's song" , "Here you get inferior accommodation" .)

I've seen this clue in The Telegraph.
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