Lunar phase (3,4)

I think it could be either:

Which length description are you looking for?:

3,4

4-4

new moon

'lunar phase' is the definition.
(phase of the moon)

This is the entire clue.

(Other definitions for new moon that I've seen before include "emergent body" , "First appearance of a waxing satellite" , "Satellites phase" , "Early lunar crescent" , "Phase of Earth's satellite" .)

I've seen this clue in The Guardian.

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