One doing the dirty out of wrath? (3)
I believe the answer is:
rat
'one doing the dirty out' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'of wrath?' is the wordplay.
'of' indicates a hidden word.
'RAT' can be found hidden inside 'wrath'.
Can you help me to learn more?
(Other definitions for rat that I've seen before include "Renegade" , "Strike-breaker" , "Rodent; informer (colloq.)" , "Scumbag" , "Sewer rodent" .)