Crossword Genius

Authorisation for a significant assignment (10)

Ross

I believe the answer is:

permission

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

'authorisation' is the definition.
(I know that permission is a type of authorisation)

'a significant assignment' is the wordplay.
'a' becomes 'per' (eg 'one a day' means 'one per day').
'significant assignment' becomes 'mission' (mission is a kind of assignment. I am not sure about the 'significant' bit.).
'per'+'mission'='PERMISSION'

'for' acts as a link.

Can you help me to learn more?

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

I've seen this clue in The Telegraph.
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