A different part of area, not Hertfordshire (7)

I believe the answer is:

another

'a different' is the definition.
(I've seen this before)

'part of area not hertfordshire' is the wordplay.
'part of' says the answer is hidden in the clue.
'ANOTHER' is hidden in the letters of 'area not hertfordshire'.

(Other definitions for another that I've seen before include "A different one" , "encore?" , "Somebody else" , "Additional: alternative" , "second" .)

I've seen this clue in The Daily Express.

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