Crossword Genius

Stay calm and don't undress! (4,4,5,2)

Ross

I believe the answer is:

keep your shirt on

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'stay calm' is the definition.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for keep your shirt on that I've seen before include "Unlike a ruined gambler" , "Avoid exposing body to sun's rays" , "remain cool" , "don't panic!" , "Not topless please" .)

I've seen this clue in The Telegraph.
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