Yes, CLOCKED is a Scrabble word!

Letter values in Scrabble US: C 3, L 1, O 1, C 3, K 5, E 1, D 2.

Is it a valid word?

CLOCKED is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

measure the time or duration of an event or action or the person who performs an action in a certain period of time