Cry that goes up when there's not enough salad? (4)
I believe the answer is:
alas
'cry' is the definition.
(I have seen 'Cry of grief' mean 'alas' so perhaps 'cry' could also mean 'alas')
'goes up when there's not enough salad?' is the wordplay.
I cannot really understand how this works, but
'when' could be 'as' (eg 'when I walked' means 'as I walked') and 'as' is located in the answer.
This explanation may well be incorrect...
'that' acts as a link.
Can you help me to learn more?
(Other definitions for alas that I've seen before include "Sad to say!" , "Cry of grief" , "'- Poor Yorick' (Hamlet)" , "Sadly, unfortunately" , "By bad luck" .)