Welsh county created in 1972 from the administrative counties of Cardiganshire, Carmarthenshire and Pembrokeshire (5)

I believe the answer is:

dyfed

(Other definitions for dyfed that I've seen before include "Carmarthen area?" , "Area of Wales" , "County in southwest Wales" , "It was Cardiganshire, Carmarthenshire and Pembrokeshire" , "Former Welsh county" .)

I've seen this clue in The Independent.

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