Like many London skies (4)

I believe the answer is:

grey

(Other definitions for grey that I've seen before include "Neutral tone lacking colour" , "Bushy-tailed North America rodent, now a UK pest" , "Nondescript; overcast (sky)" , "Colour; dull and nondescript" , "Drab colour" .)

I've seen this clue in The New York Times.

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