Area on field where ten play badly and fight (7,3)
I believe the answer is:
penalty box
'area on field' is the definition.
(area on a rugby pitch)
'ten play badly and fight' is the wordplay.
'badly' is an anagram indicator.
'and' means one lot of letters go next to another.
'fight' becomes 'box' (boxing is a kind of fighting).
'ten'+'play'='tenplay'
'tenplay' with letters rearranged gives 'penalty'.
'penalty'+'box'='PENALTY BOX'
'where' acts as a link.
(Other definitions for penalty box that I've seen before include "area spotted?" , "Spot container" .)