Crossword Genius

Gladstone’s boy (3)

Ross

I believe the answer is:

lad

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'boy' is the definition.
(informal term for boy)

'gladstone's' is the wordplay.
'LAD' 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 lad that I've seen before include "Chap, fellow" , "A young chap into ballads" , "Stable employee" , "Boy, young man" , "(Housman's Shropshire) boy" .)

I've seen this clue in The Mirror.
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