County of Watford and Ware (13)

I believe the answer is:

hertfordshire

'county of watford and ware' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for hertfordshire that I've seen before include "County of Watford and Ware" , "Watford's county" , "A home county" , "County to N. of London" , "Southern county" .)

I've seen this clue in The Guardian.

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