Oh, dear! (4)
'oh dear' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alas that I've seen before include "Cry of regret" , "Expression of regret" , "Regretfully!" , "Sad to say!" , "Cry of grief" .)
(Other definitions for love that I've seen before include "affair? On the contrary" , "It's nothing in tennis" , "Zero score, dear" , "Passionate desire" , "No points" .)