Lining up for vinaigrette, perhaps? (8)
I believe the answer is:
dressing
I believe this clue is a double definition.
'lining up' is the first definition.
('dress' can be a synonym of 'line up')
'for vinaigrette perhaps?' is the second definition.
(vinaigrette is a kind of dressing)
(Other definitions for dressing that I've seen before include "Sauce for salads" , "Sauce - protection for wound" , "bedroom procedure?" , "French or vinaigrette, say" , "but not stripping!" .)