Ban bag, more toxic (7)

I believe the answer is:

embargo

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

'ban' is the definition.
(I know that embargo is a kind of ban)

'bag more toxic' is the wordplay.
'bag more' can be anagrammed to 'EMBARGO'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for embargo that I've seen before include "Restraint - prohibition" , "Prohibit" , "Trading ban" , "Trade stoppage" , "Government order imposing a trade barrier" .)

I've seen this clue in The Telegraph.

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