Infer Uncle Duff has many online followers? (10)

I believe the answer is:

influencer

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

'many online followers?' is the definition.
The definition suggests a singular noun which matches the answer.

'infer uncle duff' is the wordplay.
'infer uncle' can be anagrammed to 'INFLUENCER'.
But, I'm not sure how the anagram is indicated.

'has' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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