Deep sorrow (5)
'deep sorrow' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for grief that I've seen before include "Anguish" , "Great mourning" , "Heartbreak" , "Sharp sorrow" , "Misery" .)
(Other definitions for woe that I've seen before include "Archaic sorrow or grief" , "Difficulty" , "Trouble" , "Archaic sorrow or distress" , "'Wednesday's child is full of ...'" .)