Employed you and me and another chap (4)
I believe the answer is:
used
'employed' is the definition.
('use' can be a synonym of 'employ')
'you and me and another chap' is the wordplay.
'you and me' becomes 'us'.
'and' says to put letters next to each other.
'another chap' becomes 'ed' (short for Edward. I am not sure about the 'another' bit.).
'us'+'ed'='USED'
Can you help me to learn more?
(Other definitions for used that I've seen before include "Enjoyed" , "No longer new" , "Hand-me-down" , "Pre-owned" , "cast off" .)