Designer getting into trouble has quit (8)

I believe the answer is:

resigned

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

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

'designer getting into trouble' is the wordplay.
'designer' anagrams to 'RESIGNED'.
But, I'm unsure how the anagram is indicated.

'has' is the link.

Can you help me to learn more?

(Other definitions for resigned that I've seen before include "without hope of change" , "Gave up one's job" , "Quit" , "Stepped down" , "Stopped working" .)

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