Flog popular Rupert Bears (6)

I believe the answer is:

larrup

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

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

'popular rupert bears' is the wordplay.
'LARRUP' is hidden in amongst the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for larrup that I've seen before include "Flog" , "Hit hard" .)

I've seen this clue in The Telegraph.

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