Crossword Genius

Nan’s an alternate word for grandmothers (6)

Ross

I believe the answer is:

nannas

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

'grandmothers' is the definition.
(I know this)

'nan's an alternate word' is the wordplay.
'nan's an' anagrams to 'NANNAS'.
Though, I'm unsure how this is indicated.

'for' is the link.

Can you help me to learn more?

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