Lout's two children almost going head-to-head (5)
I believe the answer is:
yobbo
'lout's' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for yobbo that I've seen before include "Surly youth" , "Rude and aggressive youth" , "Tough bloke" , "Young troublemaker" , "Thug" .)