Slight gains ultimately reduced all round (6)
I believe the answer is:
insult
'all round' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?
'slight gains ultimately reduced' is the wordplay.
'reduced' indicates the answer is hidden within the clue (reducing the letters in the clue shows the answer).
'INSULT' can be found hidden inside 'slight gains ultimately'.
Can you help me to learn more?
(Other definitions for insult that I've seen before include "Speak or act in way designed to hurt" , "Treat with abuse" , "Slander" , "Cause offence to" , "Affront, offend" .)