Houston also signed Danuel House Jr. to a two-way contract.
The Rockets waived House this week, reportedly because the team hoped to acquire a player via trade. With no deal as of yet, the team has apparently locked up undrafted free agent Clark, who was previously on a two-way contract.
Clark has emerged as a rotation piece for Houston this season, averaging 3.4 points and 2.9 rebounds in 17 minutes a game. House had also seen heavy minutes recently due to injuries, with coach Mike D'Antoni previously saying the swingman "belongs in the NBA somewhere."