Sacred area? (4)

I believe the answer is:

acre

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

'area?' is the definition.
(an acre is an area of land)

'sacred' is the wordplay.
'ACRE' is hidden in amongst the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for acre that I've seen before include "Not a lot of land" , "A state of W Brazil" , "4840 sq yds" , "holy city" , "Four thousand, eight hundred and forty square yards" .)

I've seen this clue in the Evening Standard.

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