Crossword Genius

Figures out the wrong date for a building (7)

Ross

I believe the answer is:

citadel

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

'a building' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'figures out the wrong date' is the wordplay.
'figures' becomes 'cil' (I can't explain this - if you can you should believe this answer much more).
'out' is an insertion indicator.
'the wrong' is an anagram indicator.
'date' is an anagram of 'tade'.
'cil' enclosing 'tade' is 'CITADEL'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for citadel that I've seen before include "Stronghold into which people could go for shelter during a battle" , "Stronghold (of the Salvation Army?)" , "Highly-secure building" , "Fortress -- dialect (anag)" , "Stronghold usually within the walls" .)

I've seen this clue in the Evening Standard.
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