Food for indicators of a drowning mouse! (6,3,6)
I believe the answer is:
bubble and squeak
'food' is the definition.
(bubble and squeak is a kind of food)
'indicators of a drowning mouse' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
This may be the basis of clue (or it may be nonsense).
'for' is the link.
Can you help me to learn more?
(Other definitions for bubble and squeak that I've seen before include "Dish of leftovers" , "food" , "breakfast?" , "course" .)