Crossword Genius

Old people sign (4)

Ross

I believe the answer is:

omen

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

'old people' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'people' becomes 'men' (man is a kind of person).
'o'+'men'='OMEN'

(Other definitions for omen that I've seen before include "writing on the wall" , "Augury, portent" , "Event regarded as a prophetic sign of good or evil" , "Portent, prophetic sign" , "Portent of evil" .)

I've seen this clue in The Telegraph.
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