Lass excited about turning up silk trousers (6)
I believe the answer is:
slacks
'trousers' is the definition.
(type of trousers)
'lass excited about turning up silk' is the wordplay.
'excited' indicates an anagram.
'about' means one lot of letters goes inside another.
'turning up' says the letters should be written backwards.
'silk' becomes 'kc' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'kc' in reverse letter order is 'ck'.
'lass' with letters rearranged gives 'slas'.
'slas' enclosing 'ck' is 'SLACKS'.
Can you help me to learn more?
(Other definitions for slacks that I've seen before include "Works lazily; trousers" , "Loose casual trousers" , "Pants for casual wear" , "casual attire" , "Things to wear" .)