Classic dish in France is hot and cold joints (4,3,5)
I believe the answer is:
fish and chips
'classic dish' is the definition.
'fish and chips' can be an answer for 'dish' (fish and chips is a kind of dish). I'm not sure about the 'classic' bit.
'france is hot and cold joints' is the wordplay.
'france' becomes 'f'.
'hot' becomes 'h' (abbreviation eg on taps).
'cold' becomes 'C' (eg on taps).
'joints' becomes 'hips' (hip is a kind of joint).
'f'+'is'+'h'+'and'+'c'+'hips'='FISH AND CHIPS'
'in' is the link.
Can you help me to learn more?
(Other definitions for fish and chips that I've seen before include "Fried dish" , "Traditional British takeaway food" , "Fast food" , "Food traditionally served in newspaper" , "Popular British meal" .)