1. a clause that used to be part of the contract with a professional athlete extending the contract for a year beyond its expiration; - Example: "the reserve clause was used to bind players to a particular ball club"
WordNet (r) 3.0 (2006):
reserve clause
n 1: a clause that used to be part of the contract with a
professional athlete extending the contract for a year
beyond its expiration; "the reserve clause was used to bind
players to a particular ball club"