Quarreling — or turning up on side (6)
I believe the answer is:
rowing
'quarreling aeur' is the definition.
I can't tell whether this definition defines the answer.
'or turning up on side' is the wordplay.
'turning up' shows that the letters should be reversed in order.
'on' means one lot of letters go next to another.
'side' becomes 'wing' (I've seen this in other clues).
'or' written backwards gives 'ro'.
'ro'+'wing'='ROWING'
Can you help me to learn more?
(Other definitions for rowing that I've seen before include "Propelling boat with oars" , "Olympic event" , "in dispute" , "Using oars" , "Sculling sport?" .)