Leaves for lunch? (5)
I believe the answer is:
'leaves for lunch?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for salad that I've seen before include "Mixed food" , "Green, potato, Russian or Waldorf?" , "One may well be green" , "Raw vegetable dish" , "One that may be dressed for dinner" .)