Crossword Genius

Nanny, say, has a go at this! (4)

Ross

I believe the answer is:

goat

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

'nanny say' is the definition.
(nanny is a kind of goat)

'a go at this' is the wordplay.
I cannot really see how this works, but
'a' is within the answer.
'go' is within the answer.
A single letter 't' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

'has' is the link.

Can you help me to learn more?

(Other definitions for goat that I've seen before include "foolish person" , "Capricorn animal" , "Butting nanny, perhaps?" , "lecherous sort" , "nanny, for example" .)

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