Crossword Genius

There's not a lot of juice in one (4)

Ross

I believe the answer is:

cell

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

'lot of juice in one' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for cell that I've seen before include "Basic unit of living matter" , "Monastic room" , "Prisoner's accommodation" , "Small room for confining a prisoner" , "Animal or plant building unit" .)

I've seen this clue in the Evening Standard.
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