Eating tonnes occasionally, like French soup (8)
I believe the answer is:
consomme
'soup' is the definition.
(I know that Consomme is a type of soup)
'eating tonnes occasionally like french' is the wordplay.
'eating' is an insertion indicator.
'occasionally' indicates alternate letters (letters taken at regular intervals or occasions).
'like french' becomes 'comme' (I can't explain this - if you can you should give a lot more credence to this answer).
The alternate letters of 'tonnes' are 'ons'.
'ons' inserted into 'comme' is 'CONSOMME'.
Can you help me to learn more?
(Other definitions for consomme that I've seen before include "Clear soup usually of beef, veal or chicken" , "Clear meaty soup" , "liquid course" , "Clear French meat soup" , "Scone, mom eaten with soup" .)