Oddly stand down (3)
I believe the answer is:
sad
'down' is the definition.
(I've seen this in another clue)
'oddly stand' is the wordplay.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
The alternate letters of 'stand' are 'SAD'.
(Other definitions for sad that I've seen before include "Deplorable" , "Melancholy, depressed" , "Effect of winter darkness" , "Blue" , "Miserable" .)