Crossword Genius

A bit of alcohol's appropriate for children, silly (4)

Ross

I believe the answer is:

unit

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

'a bit' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for unit that I've seen before include "Kitchen fitment" , "Small group" , "army group" , "Entity, system; component group" , "Individual thing or group regarded as complete" .)

I've seen this clue in The Independent.
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