Crossword Genius

Basic sustenance of rhino as well as goat (5-3-6)

Ross

I believe the answer is:

bread-and-butter

I'm a little stuck... Click here to teach me more about this clue!

'basic' is the definition.
(I've seen this in another clue)

'sustenance of rhino as well as goat' is the wordplay.
I cannot really see how this works, but
'sustenance' could be 'butter' (butter is a kind of sustenance) and 'butter' is found within the answer.
'rhino' could be 'bread' (I've seen this before) and 'bread' is present in the answer.
'as well' could be 'and' (I've seen this in other clues) and 'and' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for bread-and-butter that I've seen before include "standard" , "livelihood" , "Basic" , "Living" , "Materialistic, practical" .)

I've seen this clue in the Sydney Morning Herald.
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