Aunt mad for fish (4)

I believe the answer is:
tuna
'fish' is the definition.
(tuna is a type of fish)
'aunt mad' is the wordplay.
'mad' is an anagram indicator.
'aunt' with letters rearranged gives 'TUNA'.
'for' is the link.
(Other definitions for tuna that I've seen before include "Species of fish" , "Large salt water fish" , "Fish; edible cactus" , "Popular food fish" , "Fish sold in cans" .)