Cleaner Arctic hare camouflages (4)

I believe the answer is:

char

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

'cleaner' is the definition.
(I've seen this before)

'arctic hare camouflages' is the wordplay.
'CHAR' is hidden within the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for char that I've seen before include "Brown" , "Perhaps overheat" , "Scorch, small fish" , "Partly burn - cleaning woman" , "Noiseless" .)

I've seen this clue in The Telegraph.

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