Young socialite departs before westbound train comes in (9)
I believe the answer is:
debutante
'westbound train comes in' is the definition.
I can't tell whether this definition defines the answer.
'young socialite departs before' is the wordplay.
'young socialite' becomes 'deb' (I've seen this before).
'departs' becomes 'ut' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'before' becomes 'ante' (I've seen this before).
'deb'+'ut'+'ante'='DEBUTANTE'
Can you help me to learn more?
(Other definitions for debutante that I've seen before include "One coming out" , "Young woman entering society" , "Young lady making her first appearance in society" , "girl coming out" , "young lady coming out" .)