In super-busy environment had failed to feed little animal (8)
I believe the answer is:
madhouse
'in super-busy environment' is the definition.
I can't judge whether this definition defines the answer.
'had failed to feed little animal' is the wordplay.
'failed' is an anagram indicator.
'to feed' indicates putting letters inside (inserted letters are fed into the word).
'little animal' becomes 'mouse' (mouse is a kind of animal. I am not sure about the 'little' bit.).
'had' anagrammed gives 'adh'.
'adh' placed into 'mouse' is 'MADHOUSE'.
Can you help me to learn more?
(Other definitions for madhouse that I've seen before include "pandemonium?" , "State of uproar and total confusion" , "asylum" , "state of chaos" , "9d 21d [BEDLAM]" .)