Needing cheering (3)
I believe the answer is:
sad
'needing cheering' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sad that I've seen before include "Regrettable" , "Effect of winter darkness" , "Melancholy, triste" , "Mournful - sorry" , "Melancholy, downhearted" .)