Crossword Genius

A youngster takes it to be an obsolete measure (5)

Ross

I believe the answer is:

cubit

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'obsolete measure' is the definition.
'cubit' can be an answer for 'measure' (cubit is a kind of measure). I am not certain of the 'obsolete' bit.

'a youngster takes it' is the wordplay.
'a youngster' becomes 'cub' (cub can mean a young person).
'takes' means one lot of letters go next to another.
'cub'+'it'='CUBIT'

'to be an' is the link.

Can you help me to learn more?

(Other definitions for cubit that I've seen before include "Old forearm measure" , "Ancient linear measure" , "about eighteen inches" , "distance" , "Biblical length of approximately a forearm" .)

I've seen this clue in the Evening Standard.
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