Left before the end of having sex, needing straightening (5)
I believe the answer is:
atilt
'end of having sex needing straightening' is the definition.
I can't judge whether this definition defines the answer.
'left before the' is the wordplay.
'left' becomes 'atil' (I can't justify this - if you can you should give a lot more credence to this answer).
'before' says to put letters next to each other.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'atil'+'t'='ATILT'
Can you help me to learn more?
(Other definitions for atilt that I've seen before include "Pulled tight" , "Inclined" , "Listing" , "Leaning over and nearly falling" , "Hardly straight" .)