Organisation with old pair of writers is not exposed (8)
I believe the answer is:
unopened
'organisation with old pair of writers' is the definition.
I can't tell whether this defines the answer.
'not exposed' is the wordplay.
'not' becomes 'un' (I've seen this in other clues).
'exposed' becomes 'opened' (I've seen this before**).
'un'+'opened'='UNOPENED'
'is' is the link.
Can you help me to learn more?
(Other definitions for unopened that I've seen before include "Remaining closed" , "Still sealed as post may be" , "barred" , "shut" , "Still closed" .)