A tripe processor, illegal (6)

I believe the answer is:

pirate

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

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

'a tripe processor' is the wordplay.
'a tripe' anagrams to 'PIRATE'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for pirate that I've seen before include "Appropriate stuff" , "sailor" , "Seaborne robber" , "Copy published material illegally" , "Run off without permission" .)

I've seen this clue in the Evening Standard.

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