In Ireland it could make one glad (7)

I believe the answer is:

donegal

I'm a little stuck... Click here to teach me more about this clue!

'in ireland it' is the definition.
I can't tell whether this definition defines the answer.

'make one glad' is the wordplay.
'make' indicates an anagram.
'one'+'glad'='oneglad'
'oneglad' anagrammed gives 'DONEGAL'.

'could' acts as a link.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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