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 subsidiary indication.
'about' indicates anagramming the letters.
'with' says to put letters next to each other.
'energy' becomes 'e' (physics symbol as in E=mc2).
'arug' anagrammed gives 'argu'.
(Other definitions for argue that I've seen before include "Quarrel or disagree", "Contend, maintain", "Make a case", "Fabric hanging in folds", "Have a difference of opinion", "Squabble", "Disagree heatedly", "Contest verbally, dispute", "Debate, contest verbally" and "Have words (with)".)