Gorilla at work for Saurian (9)

I believe the answer is:

alligator

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'saurian' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'gorilla at work' is the wordplay.
'work' indicates an anagram.
'gorilla'+'at'='gorillaat'
'gorillaat' is an anagram of 'ALLIGATOR'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for alligator that I've seen before include "predator" , "Sort of hide" , "Animal of the crocodile family" , "that is scaled" , "Reptile akin to 1" .)

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

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