The living part of a cell (10)

I believe the answer is:

protoplasm

'the living part of a cell' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for protoplasm that I've seen before include "lively stuff" , "Living part of a cell" , "Basis of life" .)

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

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