Crossword Genius

What could make cat act? (7)

Ross

I believe the answer is:

anagram

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

'act?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for anagram that I've seen before include "Word(s) rearranged to form others" , "Word arranged from the letters of another" , "Mix-up" , "pouring the tea?" , "Word formed by changing the order of letters in another" .)

I've seen this clue in The Sun.
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