"Easy now!" (4)

I think it could be either:

Which length description are you looking for?:

whoa

(Other definitions for whoa that I've seen before include "Said to stop a horse" , "Instruction to a horse to stop" , "Opposite of "Giddy-up!"" , "Command to horse to stop or stand still" , "Command for horse to slow or stop" .)

I've seen this clue in the Universal.

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