King raced around racecourse (6)
I believe the answer is:
redcar
'racecourse' is the definition.
(I've seen this before)
'king raced around' is the wordplay.
'king' becomes 'r' (r is abbreviation for rex).
'around' indicates an anagram.
'raced' is an anagram of 'edcar'.
'r'+'edcar'='REDCAR'
(Other definitions for redcar that I've seen before include "Town in Cleveland" , "North Yorkshire town" , "Town near 11 [HARTLEPOOL]" , "Racecourse" , "northern coastal town" .)