Crossword Genius

Gladstone's youth (3)

Ross

I believe the answer is:

lad

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

'youth' is the definition.
(lad means a young man)

'gladstone's' is the wordplay.
'LAD' is hidden within the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for lad that I've seen before include "Stable worker" , "Youngster" , "Boy or youth" , "Chap, fellow" , "(Housman's Shropshire) boy" .)

I've seen this clue in The Mirror.
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