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'm uncertain 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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