Various kinds of fish in large cask, as follows (5)
I believe the answer is:
tunas
'various kinds of fish' is the definition.
I can't judge whether this defines the answer.
'large cask as follows' is the wordplay.
'large cask' becomes 'tun' (type of container for alcohol).
'follows' is a charade indicator (letters next to each other).
'tun'+'as'='TUNAS'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for tunas that I've seen before include "pears? Exotic, perhaps" , "Two kinds of fish" .)