Legal process taking a toll on fellow (7)
I believe the answer is:
hearing
'legal process' is the definition.
(I've seen this before)
'a toll on fellow' is the wordplay.
'toll' becomes 'ring' (I've seen this before).
'on' means one lot of letters go next to another.
'fellow' becomes 'he' (I've seen this in other clues**).
'a'+'ring'='aring'
'aring' after 'he' is 'HEARING'.
'taking' is the link.
(Other definitions for hearing that I've seen before include "Earshot; trial" , "Perceiving sound" , "Trial before a judge" , "Trial; sense" , "Legal process" .)