Sharp cry of Dubliner? (4)

I believe the answer is:

keen

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This could be a double definition.

'sharp' is the first definition.
(I know that sharp can be written as keen)

'cry of dubliner?' is the second definition.
'keen' can be an answer for 'cry' (I've seen this before). I am not certain of the 'of dubliner?' bit.

Can you help me to learn more?

(Other definitions for keen that I've seen before include "Diligent" , "(Of a blade) sharp" , "Itching" , "Anxious" , "Quick" .)

I've seen this clue in The Times.

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