Former pseuds delaying European revelations (9)
I believe the answer is:
exposures
'revelations' is the definition.
(I know this)
'former pseuds delaying european' is the wordplay.
I cannot quite understand how this works, but
'former' could be 'ex' (prefix meaning former or onetime) and 'ex' is found within the answer.
'european' could be 'e' (abbreviation e.g. EU) and 'e' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for exposures that I've seen before include "Snaps" , "Revelations (of scandals, etc)" .)