Crossword Genius

Authorisation could be, for instance, like this (3-2)

Ross

I believe the answer is:

say-so

'authorisation' is the definition.
(I know that authorisation can be written as say-so)

'for instance like this' is the wordplay.
'for instance' becomes 'say' (both can be used to introduce an example).
'like this' becomes 'so' ('like so').
'say'+'so'='SAY-SO'

'could be' is the link.

(Other definitions for say-so that I've seen before include "Authorisation" , "Authority - rumour" , "Final authority" , "Mere assertion (colloq.)" , "Authority to make or allow something to happen" .)

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