Chance to host first of three contests (6)
I believe the answer is:
events
'contests' is the definition.
(I've seen this before)
'chance to host first of three' is the wordplay.
'chance' becomes 'evens' (I've seen this before).
'to host' indicates putting letters inside (inserted letters are hosted or welcomed).
'first of three' becomes 't' (1st letter of 'three').
'evens' enclosing 't' is 'EVENTS'.
(Other definitions for events that I've seen before include "Things taking place" , "promotions" , "matters" , "Important happenings for Steven" , "Incidents, occasions" .)