Obtain licence finally authorised (6)
I believe the answer is:
elicit
'obtain' is the definition.
(I've seen this before)
'licence finally authorised' is the wordplay.
'finally' says to take the final letters.
'authorised' becomes 'licit' (licit can mean authorised or allowed).
The last letter of 'licence' is 'e'.
'e'+'licit'='ELICIT'
(Other definitions for elicit that I've seen before include "Draw out, information or explanation" , "'Draw out, evoke (6)'" , "Draw out from, meaning or response" , "Worm out" , "Draw out or bring forth" .)