Game personnel in industrial area (4)
I believe the answer is:
ruhr
'industrial area' is the definition.
(I've seen this before)
'game personnel' is the wordplay.
'game' becomes 'RU' (rugby union).
'personnel' becomes 'HR' (Human Resources).
'ru'+'hr'='RUHR'
'in' is the link.
(Other definitions for ruhr that I've seen before include "Traditional region of German heavy industry" , "German industrial region" , "Ger. industrial region" , "German industrial zone, river" , "Dortmund area?" .)