Get nurses behind surgery high on gas (6)
I believe the answer is:
bubbly
'high on gas' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?
'get nurses behind surgery' is the wordplay.
'get' becomes 'buy' (buying is a kind of getting).
'nurses' indicates putting letters inside (nurse can mean to hold onto or harbour).
'behind surgery' becomes 'bbl' (I can't justify this - if you can you should believe this answer much more).
'buy' enclosing 'bbl' is 'BUBBLY'.
Can you help me to learn more?
(Other definitions for bubbly that I've seen before include "lively" , "Champers" , "Drink" , "Effervescent" , "Informal champagne" .)