Irish girl Siobhan regularly left embracing marine (7)

I believe the answer is:

iseabal

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'irish girl' is the definition.
'Iseabal' can be an answer for 'girl'. I am unsure of the 'irish' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

I've seen this clue in The Times and The Sunday Times.

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