Alarming, stumbling on the edge (8)

I believe the answer is:

marginal

'on the edge' is the definition.
(I've seen this before)

'alarming stumbling' is the wordplay.
'stumbling' is an anagram indicator.
'alarming' with letters rearranged gives 'MARGINAL'.

(Other definitions for marginal that I've seen before include "on border" , "unsafe seat" , "having small majority at risk" , "Very close (decision)" , "Borderline" .)

I've seen this clue in The Independent.

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