Green and white-shirted Scottish football team (6)

I believe the answer is:

celtic

(Other definitions for celtic that I've seen before include "This tiger is credited with Irish prosperity" , "Like, eg, Welsh, Gaelic" , "Language group including Manx" , "Language group containing 14 & 15 across" , "The sea between south Ireland and Cornwall" .)

I've seen this clue in The Times and The Sunday Times.

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