Punk gigs are about embracing singular hostility (10)
I believe the answer is:
aggression
'hostility' is the definition.
(aggression is a kind of hostility)
'punk gigs are about embracing singular' is the wordplay.
I cannot really see how this works, but
'punk' could be 'i' (where the crossword setter is 'Punk') and 'i' is found in the answer.
'are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is present in the answer.
'about' could be 're' (regarding) and 're' is present in the answer.
'singular' could be 's' (abbreviation sometimes used in dictionaries) and 's' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for aggression that I've seen before include "Unprovoked attack" , "Violent hostility" , "warlike attitude" , "Act of aggression,physical force" , "Use of armed force" .)