Desirable title? (3)

I believe the answer is:

sir

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'title?' is the definition.
(respectful address for a man)

'desirable' is the wordplay.
'SIR' is hidden in amongst the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for sir that I've seen before include "Honourable title" , "Feted fellow" , "Way to address gentleman" , "Title of Kt or Bart" , "Polite term of address for a man" .)

I've seen this clue in the Evening Standard.

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