Obscene part for actor provided by new Stoppard play (5,5)
I believe the answer is:
dirty linen
'stoppard play' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'obscene part for actor provided by new' is the wordplay.
'obscene' becomes 'dirty' (similar in meaning).
'part for actor' becomes 'line' (I can't explain this - if you can you should give a lot more credence to this answer).
'provided by' says to put letters next to each other.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'dirty'+'line'+'n'='DIRTY LINEN'
Can you help me to learn more?
(Other definitions for dirty linen that I've seen before include "of a laundryman" , "Better not wash this in public" , "The intimate secrets" , "personal problems (like the infamous dress?)" , "laundry" .)