Stray serving man held up by groom (7)

I believe the answer is:

digress

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'stray' is the definition.
(I know that stray can be written as digress)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for digress that I've seen before include "Be sidetracked" , "Stray from the point" , "Turn aside (from the main subject?)" , "Go off the main subject" , "Leave the main subject" .)

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