A border of bright red geraniums (4)

I believe the answer is:

edge

'a border' is the definition.
(I know that border can be written as edge)

'of bright red geraniums' is the wordplay.
'of' says the answer is hidden in the clue.
'EDGE' is hidden in the letters of 'bright red geraniums'.

(Other definitions for edge that I've seen before include "Rim or sharp side of knife" , "Margin, extremity" , "Brink or border" , "on which one is ill at ease?" , "Outer limit" .)

I've seen this clue in the Evening Standard.

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