Crossword Genius

Reportedly flog prisoner here (4)

Ross

I believe the answer is:

cell

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

'prisoner here' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'reportedly flog' is the wordplay.
'reportedly' shows a homophone (sound like).
'flog' becomes 'sell' (I've seen this before).
'sell' sounds like 'CELL'.

Can you help me to learn more?

(Other definitions for cell that I've seen before include "Chamber" , "Unit of animal or plant structure" , "required for current generation?" , "Small room for nun, monk or prisoner" , "Microscopic unit of living matter" .)

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app