Can it make one glad to be in Ireland? (7)

I believe the answer is:

donegal

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'in ireland?' is the definition.
(I know that Donegal is a county of Ireland)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for donegal that I've seen before include "Irish town" , "Lean dog (anag) - Irish county" , "County of NW Ireland" , "County of NW?Ireland" , "Ireland's northmost county" .)

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