Dash across European court area (7)
I believe the answer is:
hectare
'area' is the definition.
(I've seen this before)
'dash across european court' is the wordplay.
'dash' becomes 'hare' (both can mean to run very fast).
'across' indicates putting letters inside.
'european' becomes 'e' (abbreviation e.g. EU).
'court' becomes 'ct'.
'e'+'ct'='ect'
'hare' placed around 'ect' is 'HECTARE'.
(Other definitions for hectare that I've seen before include "Metric land area" , "The race (anag) - unit of area" , "Ten thousand square metres" , "10,000 square metres" , "10,000 squaer metres" .)