Reach emergency room -- on this! (9)
I believe the answer is:
stretcher
'this' is the definition.
The definition suggests a singular noun which matches the answer.
'reach emergency room on' is the wordplay.
'reach' becomes 'stretch' (synonyms).
'emergency room' becomes 'ER' (abbreviation popularized by US TV series).
'on' says to put letters next to each other.
'stretch'+'er'='STRETCHER'
Can you help me to learn more?
(Other definitions for stretcher that I've seen before include "Carrier for injured person" , "Carrier for sick/wounded" , "Makeshift bed" , "patient's put on" , "for carrying the sick" .)