Dandruff in animal's hair occurring twice (6)

I believe the answer is:

furfur

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

'dandruff in animal's' is the definition.
'furfur' can be an answer for 'dandruff' (thesaurus). I'm unsure of the 'in animal's' bit.

'hair occurring twice' is the wordplay.
'hair' becomes 'fur' (fur is a kind of hair).
'occurring twice' becomes 'fur' (I am not sure about this - if you are sure you should believe this answer much more).
'fur'+'fur'='FURFUR'

Can you help me to learn more?

(Another definition for furfur that I've seen is " dander".)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.