Express distress (3)
I believe the answer is:
sob
'express distress' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sob that I've seen before include "Wep convulsively" , "Shake with tears" , "Weep audibly" , "Weep convulsively" , "Weep noisily" .)