During lunch I contact one Marx (5)
I believe the answer is:
chico
'marx' is the definition.
(chico marx was a marx brother)
'during lunch i contact one' is the wordplay.
'during' indicates a hidden word.
'CHICO' is hidden in the letters of 'lunch i contact one'.
(Other definitions for chico that I've seen before include "A Marx brother" , "Eldest of the Marx Brothers" , "One of Groucho's brother" , "One of the Marx Brothers" .)