It’s outrageous, putting all the fish in that, in short! (3,4,4)
I believe the answer is:
the very idea
'it's outrageous' is the definition.
(phrase said when outraged)
'all the fish in that in short' is the wordplay.
I cannot quite understand how this works, but
'all' could be 'every' (similar in meaning) and 'every' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'fish' could be 'ide' (I've seen this before) and 'ide' is located in the answer.
The remaining letters 'ha' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'putting' is the link.
(Other definitions for the very idea that I've seen before include "that's absurd!" , "Well really" , "No way" , "That's outrageous!" .)