Life making old man upset about island (6,7)
I believe the answer is:
animal kingdom
'life' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'making old man upset about island' is the wordplay.
'upset' indicates an anagram.
'about' indicates putting letters inside.
'island' becomes 'i' (geographical abbreviation).
'making'+'old'+'man'='makingoldman'
'makingoldman' anagrammed gives 'animalkngdom'.
'animalkngdom' going around 'i' is 'ANIMAL KINGDOM'.
Can you help me to learn more?
(Other definitions for animal kingdom that I've seen before include "Creatures collectively" , "beastly lot" , "beasts in general" , "Moving organisms in general" .)