Animal concealed in red bag (6)

I believe the answer is:

badger

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

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

'concealed in red bag' is the wordplay.
'red bag' can be anagrammed to 'BADGER'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for badger that I've seen before include "Pester -- nocturnal mammal" , "Pester the burrowing animal" , "Animal hunted by stocky dog" , "Disturb" , "Burrowing carnivore" .)

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