Row about a rug with energy (5)
I believe the answer is:
Here is my best explanation:
'row' is the definition.
(I've seen this before)
'about a rug with energy' is the wordplay.
'about' is an anagram indicator.
'with' means one lot of letters go next to another.
'energy' becomes 'e' (physics symbol as in E=mc2).
'arug' with letters rearranged gives 'argu'.
(Other definitions for argue that I've seen before include "Altercate", "contradict", "Make a case", "Fabric hanging in folds", "Fall out", "Have words (with)", "Heatedly exchange views", "Have a difference of opinion", "Debate, contest verbally" and "Disagree heatedly".)