One is relocated after faeces found in cell (7)
I believe the answer is:
dungeon
'cell' is the definition.
(underground cell)
'one is relocated after faeces' is the wordplay.
'is relocated' indicates anagramming the letters (letters get relocated).
'after' is a charade indicator (letters next to each other).
'faeces' becomes 'dung' (dung is a kind of faeces).
'one' is an anagram of 'eon'.
'eon' put after 'dung' is 'DUNGEON'.
'found in' acts as a link.
(Other definitions for dungeon that I've seen before include "part of prison" , "Prison cell, often underground" , "Place of confinement underground" , "Keep" , "old prison" .)