Support for trees toppling over after I departed? That’s a setback; … (7)
I believe the answer is:
relapse
'setback' is the definition.
(I've seen this in another clue)
'support for trees toppling over after i departed?' is the wordplay.
I cannot quite see how this works, but
'over' could be 're' and 're' is found within the answer.
'i' could be 'a' and 'a' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'that's a' is the link.
Can you help me to learn more?
(Other definitions for relapse that I've seen before include "Take a turn for the worse" , "Pleaser may slip to earlier state" , "Fall back (into ill health)" , "Fall back into former condition, being pleaser" , "Get worse again" .)