Hiding source of tension, Dane and vet broke up feud (8)
I believe the answer is:
vendetta
'up feud' is the definition.
'vendetta' can be an answer for 'feud' (I've seen this before). I am not certain of the 'up' bit.
'hiding source of tension dane and vet broke' is the wordplay.
'hiding' means one lot of letters goes inside another.
'source of' says to take the initial letters (the start - or source - of the word).
'and' means one lot of letters go next to another.
'broke' indicates anagramming the letters.
The first letter of 'tension' is 't'.
'dane'+'vet'='danevet'
'danevet' is an anagram of 'vendeta'.
't' put inside 'vendeta' is 'VENDETTA'.
Can you help me to learn more?
(Other definitions for vendetta that I've seen before include "Bitter feud between families" , "Family blood feud" , "Unremitting battle" , "Violent quarrel" , "Long-running quarrel" .)