Actions I condemned by friend acting yobbishly (12)
I believe the answer is:
antisocially
'acting yobbishly' is the definition.
I can't tell whether this defines the answer.
'actions i condemned by friend' is the wordplay.
'condemned' indicates anagramming the letters.
'by' says to put letters next to each other.
'friend' becomes 'ally' (an ally is a friend or supporter).
'actions'+'i'='actionsi'
'actionsi' with letters rearranged gives 'antisoci'.
'antisoci'+'ally'='ANTISOCIALLY'
Can you help me to learn more?
(Another definition for antisocially that I've seen is " So as to cause annoyance to others".)