Irishman to improvise a musical piece (6)

I believe the answer is:

seamus

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'irishman' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

'improvise a musical piece' is the wordplay.
'piece' indicates the answer is hidden within the clue.
'SEAMUS' is hidden within 'improvise a musical'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for seamus that I've seen before include "Irish poet, b. 1939" , "- Heaney, Irish poet" , "Irishman?" , "Irish form of James" .)

I've seen this clue in the Sydney Morning Herald.

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