Crossword Genius

Parcel lost at the centre unit (4)

Ross

I believe the answer is:

cell

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

'unit' is the definition.
(I know that cell is a type of political entity)

'parcel lost at the centre' is the wordplay.
'CELL' is hidden in amongst the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for cell that I've seen before include "Basic unit of living matter" , "Little room" , "Chamber" , "Biological unit with a nucleus" , "Small compartment" .)

I've seen this clue in The Guardian.
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