Impression blurry in green light (10)

I believe the answer is:

permission

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

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

'impression blurry' is the wordplay.
'impression' anagrams to 'PERMISSION'.
Though, I am unsure how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for permission that I've seen before include "Leave" , "Consent, authorisation" , "Visa, eg" , "Allowance" , "Green light" .)

I've seen this clue in The Telegraph.

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