Pulsating (7)

I think it could be either:

Which length description are you looking for?:

throbbing

'pulsating' is the definition.
('throb' can be a synonym of 'pulsate')

This is all the clue.

(Other definitions for throbbing that I've seen before include "Beating" , "Pulsating" .)

I've seen this clue in The New York Times and the Sydney Morning Herald.

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