Skinhead still very young (5)

I believe the answer is:

seven

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

'very young' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'skinhead still' is the wordplay.
'skinhead' becomes 's' (head letter of 'skin').
'still' becomes 'even' (synonyms).
's'+'even'='SEVEN'

Can you help me to learn more?

(Other definitions for seven that I've seen before include "Prime number" , "See 1" , "So many ages of man (AYLI)" , "Number of sins, seas or dwarves" , "Number (of stars in the sky?)" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.