Is it used extensively by ambulance men? (9)
I believe the answer is:
stretcher
'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.
Can you help me to learn more?
(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" .)