Leftover ramen mixed in with tuna, regularly (7)
I believe the answer is:
remnant
'leftover' is the definition.
(synonyms)
'ramen mixed in with tuna regularly' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'ramen' is 'remna' which is within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for remnant that I've seen before include "Leftovers" , "offcut" , "Oddment, leftover piece, perhaps of material" , "faithful minority" , "rest" .)