Crossword Genius

Ambulance letters (3)

Ross

I believe the answer is:

'ambulance letters' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ems that I've seen before include "Units used in printing" , "Measurement units in printing" , "German city" , "Units of print measure" , "Printers' measures" .)

I've seen this clue in The New York Times, the King Feature Syndicate, the Universal and the LA Times.
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