Tyrant in flats arrested (4)

I believe the answer is:

tsar

'tyrant' is the definition.
(I've seen this before)

'in flats arrested' is the wordplay.
'in' says the answer is hidden in the clue.
'TSAR' can be found hidden inside 'flats arrested'.

(Other definitions for tsar that I've seen before include "Supreme authority" , "Russian leader" , "Rats (anag)" , "One associated with 26 [KREMLIN]" , "Supremo" .)

I've seen this clue in The Sun.

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