Injection treatment partly using same needles in recession (5)
I believe the answer is:
enema
'injection treatment' is the definition.
'enema' can be an answer for 'treatment' (enema is a kind of treatment). I am unsure of the 'injection' bit.
'partly using same needles in recession' is the wordplay.
'partly' indicates the answer is hidden within the clue (part of the clue is used).
'in recession' says the letters should be written in reverse (letters recede or go back).
'amene' is hidden within 'using same needles'.
'amene' backwards is 'ENEMA'.
Can you help me to learn more?
(Other definitions for enema that I've seen before include "Stern action from nurse perhaps" , "Fluid injected rectally" , "process to ensure evacuation" , "Suppository" , "Procedure for vacating the bowels" .)