Fouls aplenty and fight lead to sin bin (7,3)
I believe the answer is:
penalty box
'sin bin' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'fouls aplenty and fight' is the wordplay.
'fouls' indicates anagramming the letters (I've seen 'foul' mean this).
'and' means one lot of letters go next to another.
'fight' becomes 'box' (boxing is a kind of fighting).
'aplenty' with letters rearranged gives 'penalty'.
'penalty'+'box'='PENALTY BOX'
'lead to' acts as a link.
Can you help me to learn more?
(Other definitions for penalty box that I've seen before include "area spotted?" , "Spot container" .)