Young Jesuit leaving initials on large outfit (6,4)
I believe the answer is:
lounge suit
'young jesuit leaving initials on' is the definition.
I can't tell whether this definition defines the answer.
'large outfit' is the wordplay.
'large' becomes 'lounge' (I can't explain this - if you can you should give a lot more credence to this answer).
'outfit' becomes 'suit' (suit is a type of outfit).
'lounge'+'suit'='LOUNGE-SUIT'
Can you help me to learn more?
(Other definitions for lounge suit that I've seen before include "Attire" , "Formal wear" , "Common habit of man" , "Smart day wear for men" , "what smart fellow assumes" .)