Smelly old short trousers where your suit might end up (4,5)
I believe the answer is:
high court
'smelly old short trousers where your suit might end up' is the definition.
I can't judge whether this defines the answer.
'old short trousers where your suit might end up' is the wordplay.
I cannot quite see how this works, but
'old' could be 'o' (common abbreviation eg in OE for Old English) and 'o' is found in the answer.
'short' could be 'curt' ('curt' can be a synonym of 'short') and 'curt' is found within the remaining letters.
'up' could be 'high' ('high' is associated in meaning with 'up') and 'high' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for high court that I've seen is " Chancery Division is part of this".)