Some characters in courthouse with you long ago (4)
I believe the answer is:
thou
'you long ago' is the definition.
(I've seen this in another clue)
'some characters in courthouse with' is the wordplay.
'some characters in' indicates a hidden word.
'THOU' can be found hidden inside 'courthouse with'.
(Other definitions for thou that I've seen before include "Biblical 'you'" , "Subject" , "You (obs.)" , "You (arch.)" , "Archaic pronoun" .)