Crossword Genius

Wherein monks make batteries? (5)

Ross

I believe the answer is:

cells

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

'batteries?' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for cells that I've seen before include "Basic structural units of all organisms" , "Small rooms" , "terrorist groups" , "Rooms for prisoners" , "Accommodation for prisoners" .)

I've seen this clue in the Evening Standard.
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