Crossword Genius

Not grown up (8)

Ross

I believe the answer is:

immature

'not grown up' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for immature that I've seen before include "Young" , "Not yet fully-developed" , "Underdeveloped - childish" , "Like childish behaviour" , "behaviour of child" .)

I've seen this clue in The Telegraph and The Times.
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