Call and meet eccentric fellow prisoner (8)
I believe the answer is:
cellmate
'fellow prisoner' is the definition.
(I've seen this before)
'call and meet eccentric' is the wordplay.
'and' is a charade indicator (letters next to each other).
'eccentric' indicates anagramming the letters.
'call' after 'meet' is 'meetcall'.
'meetcall' anagrammed gives 'CELLMATE'.
(Other definitions for cellmate that I've seen before include "Fellow prisoner" , "Accommodation-sharer in incarceration" .)