Crossword Genius

Threat posed by fellow expert (6)

Ross

I believe the answer is:

menace

'threat' is the definition.
('menace' can be a synonym of 'threat')

'fellow expert' is the wordplay.
'fellow' becomes 'men' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'expert' becomes 'ace' (ace is a kind of expert).
'men'+'ace'='MENACE'

'posed by' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

(Other definitions for menace that I've seen before include "peril" , "serious nuisance" , "Intimidate" , "Threat, danger" , "Threat; threaten" .)

I've seen this clue in The Guardian.
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