Fresh case of Sauternes to have in for one (5)
I believe the answer is:
sassy
'fresh' is the definition.
(I know that fresh can be written as sassy)
'have in for one' is the wordplay.
'have' becomes 'ss' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'for one' becomes 'say' (both can mean 'for example').
'ss' put within 'say' is 'SASSY'.
'case of sauternes to' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for sassy that I've seen before include "Pert" , "Impertinent (US colloq.)" , "Cheeky American" , "Cheeky (US colloq.)" , "(In US) saucy" .)