Surgeon's desire (4)

I believe the answer is:

urge

I'm a little stuck... Click here to teach me more about this clue!

'desire' is the definition.
(I know that urge is a type of desire)

'surgeon's' is the wordplay.
'URGE' is hidden within the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for urge that I've seen before include "Encourage, press" , "Yen" , "Itch" , "Encourage to proceed, drive onwards" , "Strongly encourage" .)

I've seen this clue in The Mirror.

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