Crossword Genius

The missile from Uncle? (3)

Ross

I believe the answer is:

sam

This clue is a double definition.

'the missile' is the first definition.
(abbreviation for surface-to-air missile)

'uncle?' is the second definition.
(Uncle Sam is an example)

'from' is the link.

(Other definitions for sam that I've seen before include "together once" , "Uncle" , "Boy" , "Casablanca piano player" .)

I've seen this clue in the Evening Standard.
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