People in A&E taking turn, getting behind procedure (5)
I believe the answer is:
enema
'behind procedure' is the definition.
'people in ae taking turn' is the wordplay.
'people' becomes 'men' (men are people).
'in' indicates putting letters inside.
'taking turn' says the letters should be written backwards.
'men' placed within 'ae' is 'amene'.
'amene' in reverse letter order is 'ENEMA'.
'getting' is the link.
(Other definitions for enema that I've seen before include "Bowel evacuator" , "process to ensure evacuation" , "fundamental procedure?" , "Medication introduced from behind" , "In the end medical procedure" .)