Crossword Genius

One's turn done with no restraints in cell (6)

Ross

I believe the answer is:

neuron

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'cell' is the definition.
(neuron is a kind of cell)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for neuron that I've seen before include "Impulsive thing" , "Nerve impulse cell" , "Conductor" , "Part of one's nervous system" , "Transmitter of nerve impulses" .)

I've seen this clue in The Telegraph.
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