Freddy has no right to be rambling in old Wales (5)

I believe the answer is:

dyfed

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'old wales' is the definition.
The definition suggests a singular noun which matches the answer.

'freddy has no right to be rambling' is the wordplay.
'has no' is a deletion indicator.
'right' becomes 'r' (common abbreviation).
'to be rambling' indicates anagramming the letters.
'freddy' with 'r' taken away is 'feddy'.
'feddy' with letters rearranged gives 'DYFED'.

'in' is the link.

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(Other definitions for dyfed that I've seen before include "Old Welsh county" , "Carmarthen area?" , "Area of Wales" , "Region of SW Wales" , "County in southwest Wales" .)

I've seen this clue in the Evening Standard.

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