Tsar, e.g. Alexander, disguised as a king (5)

I believe the answer is:

regal

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'disguised as a king' is the definition.
I can't tell whether this defines the answer.

'tsar e g alexander' is the wordplay.
'REGAL' is hidden in amongst the letters.
But, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for regal that I've seen before include "Befitting a monarch" , "Royal - 5 down (anag)" , "King-like" , "fit for the Queen" , "Like a queen?" .)

I've seen this clue in The Mirror.

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