Sign an order at two points (4)

I believe the answer is:

omen

Here is my best explanation:

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

'an order at two points' is the wordplay.
'an order' becomes 'om' (order of merit).
'at' is a charade indicator (letters next to each other).
'two points' becomes 'en'.
'om'+'en'='OMEN'

This clue was last seen in Evening Standard