Border of united Germany (4)

I believe the answer is:

edge

'border' is the definition.
(synonyms)

'of united germany' is the wordplay.
'of' says the answer is hidden in the clue.
'EDGE' can be found hidden inside 'united germany'.

(Other definitions for edge that I've seen before include "Sharp side of a blade" , "Skirt" , "Creep" , "Force" , "Border; intense quality" .)

I've seen this clue in the Evening Standard.

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