End of census possibly not declared (11)

I believe the answer is:

unconfessed

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

'end of census possibly not declared' is the definition.
I can't judge whether this definition defines the answer.

'end of census possibly' is the wordplay.
'possibly' indicates an anagram.
'end'+'of'+'census'='endofcensus'
'endofcensus' anagrammed gives 'UNCONFESSED'.

Can you help me to learn more?

I've seen this clue in The Sunday Times.

Want a hint initially instead of a full solution? Install my app