Coward's work that may make your eyes water (3,5)
I believe the answer is:
hay fever
'coward's work that may make your eyes water' is the definition.
'hay fever' can be an answer for 'coward's' (I've seen this before). I am not sure about the remainder of the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for hay fever that I've seen before include "Allergy - Noel Coward comedy" , "Irritation caused by pollen" , "Coward's" , "It results from an allergic reaction to pollen" , "Allergy with asthmatic symptoms caused by pollen or dust" .)