Recommend a chap to Sue? (8)
I believe the answer is:
advocate
I believe this clue is a double definition.
'recommend' is the first definition.
(I know that recommend can be written as advocate)
'a chap to sue?' is the second definition.
(lawyer suing someone)
(Other definitions for advocate that I've seen before include "Promote" , "One argues another's case" , "Recommend like counsellor?" , "Proponent" , "Public supporter" .)