What a rotten churl may leave you in? (5)
I believe the answer is:
lurch
'leave you in?' is the definition.
'lurch' can be an answer for 'leave' (lurching is a kind of leaving). I am unsure of the 'you in?' bit.
'what a rotten churl' is the wordplay.
'what a rotten' indicates an anagram.
'churl' is an anagram of 'LURCH'.
'may' acts as a link.
Can you help me to learn more?
(Other definitions for lurch that I've seen before include "Move forward suddenly and unsteadily" , "Faltering movement" , "in position lacking support?" , "Move abruptly to one side" , "Stagger; abandoned, if left in it" .)