Nothing is as confusing as its mirage (5)

I believe the answer is:

oasis

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

'its mirage' is the definition.
I can't tell whether this defines the answer.

'nothing is as confusing' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'confusing' is an anagram indicator.
'is'+'as'='isas'
'isas' anagrammed gives 'asis'.
'o'+'asis'='OASIS'

'as' is the link.

Can you help me to learn more?

(Other definitions for oasis that I've seen before include "Band with Liam and Noel Gallagher" , "Place of calm in troubled times" , "Place of peace" , "Spring of fresh water in a desert" , "Peaceful spot" .)

I've seen this clue in The Globe and Mail.

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