Drummer recruited by string orchestra? (5)

I believe the answer is:

ringo

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

'drummer' is the definition.
(Ringo Starr)

'recruited by string orchestra?' is the wordplay.
'RINGO' is hidden within the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ringo that I've seen before include "John Paul I (and another) backed" , "One of The Beatles" , "The drumming Beatle" , "Beatles drummer" , "Starr drummer" .)

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