Lovely keyboard instrument in county once (9)

I believe the answer is:

glamorgan

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'county once' is the definition.
I can't tell whether this definition defines the answer.

'lovely keyboard instrument' is the wordplay.
'lovely' becomes 'glam' (glamorous).
'keyboard instrument' becomes 'organ' (I've seen this in another clue).
'glam'+'organ'='GLAMORGAN'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for glamorgan that I've seen before include "part of the Principality" , "Historic Welsh county (with cricket team)" , "Cricket side" , "part of Wales" , "Cricket club" .)

I've seen this clue in The Times.

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