kicker(n = noun.person) - a player who kicks the football;
Derived form verb kick₁

1.  One who, or that which, kicks. [1913 Webster]

2.  A fact, condition, or circumstance, sometimes concealed or not obvious, which reduces or eliminates the benefit of an apparently advantageous situation; a joker{5}; as, under the Soviet system, bread was good and cheap, but the kicker was that you waited in line for hours to get any, if it was available. [PJC]

3.  An unforeseen added expense or additional cost; as, the printer was cheap, but the special paper it needed was an expensive kicker. [PJC]