Noted old name, possibly, for a soft drink (8)
I believe the answer is:
lemonade
'for a soft drink' is the definition.
(I've seen this before)
'noted old name' is the wordplay.
'noted old' becomes 'lemon' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'name' becomes 'Ade'.
'lemon'+'ade'='LEMONADE'
'possibly' acts as a link.
Can you help me to learn more?
(Other definitions for lemonade that I've seen before include "Lead me on to the strange drink" , "Meal done (anag.)" , "Non-alcoholic drink" , "This should refresh" , "Diluted fruit drink" .)