Lessen gradually (5)

I think it could be either:

Which length description are you looking for?:

ebb

'lessen gradually' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ebb that I've seen before include "Withdraw heartless" , "Flow outwards" , "(Sea) recede" , "Type of tide" , "Abate" .)

I've seen this clue in The Wall Street Journal.

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