Managed to copyright passport when out of date, perhaps (6)
I believe the answer is:
rancid
'of date perhaps' is the definition.
I can't judge whether this definition defines the answer.
'managed to copyright passport when out' is the wordplay.
'managed' becomes 'ran' (I've seen this before).
'to copyright' becomes 'C' (as in the copyright symbol, a C in a circle).
'passport' becomes 'id' (a passport is identification).
'when' becomes 'e' (I've seen this in other clues).
'out' means to remove the last letter.
'c'+'id'+'e'='cide'
'cide' with its final letter removed is 'cid'.
'ran'+'cid'='RANCID'
Can you help me to learn more?
(Other definitions for rancid that I've seen before include "Rank, high" , "No longer fresh" , "(Of fats) stale" , "Turned - foul-smelling" , "Stinking" .)