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To
hide
tiara
from
bank
robbers
ends
in
calamity
(4)
To hide tiara from bank robbers ends in calamity (4)
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The definition is at the beginning of the clue.
How the clue works
Look at To hide — that's your definition, meaning to conceal. Now take the last letters ("ends") of tiara from bank robbers, giving you A, M, K, S. "Calamity" signals an anagram of those letters, which scrambles into MASK.