Anger's returning against friend in a row (8)
I believe the answer is:
serially
'in a row' is the definition.
I can't tell whether this definition defines the answer.
'anger's returning against friend' is the wordplay.
'anger's' becomes 'ire's' (ire is intense rage).
'returning' says the letters should be written in reverse.
'against' means one lot of letters go next to another.
'friend' becomes 'ally' (an ally is a friend or supporter).
'ires' backwards is 'seri'.
'seri'+'ally'='SERIALLY'
Can you help me to learn more?
(Other definitions for serially that I've seen before include "(Coming) one after another" , "Repeatedly" .)