Some yellow in effect for red or white? (4)
I believe the answer is:
wine
'for red or white?' is the definition.
(I've seen this in another clue)
'some yellow in effect' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'WINE' is hidden in the letters of 'yellow in effect'.
(Other definitions for wine that I've seen before include "Accompaniment for women and song?" , "Beaujolais, for example" , "champagne, perhaps" , "Something made with 16?" , "Fermented grape juice" .)