Almost fell over receiving shocking treatment when put back in (9)
I believe the answer is:
'back in' is the definition.
(I've seen this before)
'almost fell over receiving shocking treatment' is the wordplay.
'almost fell over' becomes 'reeled' (I am not sure about this - if you are sure you should believe this answer much more).
'receiving' means one lot of letters goes inside another.
'shocking treatment' becomes 'ect' (electro-convulsive therapy).
'reeled' enclosing 'ect' is 'REELECTED'.
'when put' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Another definition for reelected that I've seen is " Back in".)