To beat the clock means to finish before the time is up, so she was knocking feverishly in order to hurry up and finish before the time ran out.
Context: "She began to knock feverishly as if she had to hurry up and finish before the time ran out." Claim: "She began to knock feverishly as if she had to beat the clock."
Considering the context, is the claim true, false, or unknown?