Crossword Genius

Is it used extensively by ambulance men? (9)

Ross

I believe the answer is:

stretcher

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'it used extensively by ambulance men?' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand how the rest of the clue works.

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(Other definitions for stretcher that I've seen before include "medical ancillaries should find bearable" , "Sick or injured person may be carried on one" , "Carrier for sick/wounded" , "Litter for the sick" , "Transport for the injured" .)

I've seen this clue in the Evening Standard.
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