Love court work for powerful organisation (7)
I believe the answer is:
octopus
'powerful organisation' is the definition.
(octopus can mean a sinister organisation)
'love court work' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'court' becomes 'ct' (abbreviation used in road names).
'work' becomes 'opus' (an opus is an artistic work).
'o'+'ct'+'opus'='OCTOPUS'
'for' is the link.
(Other definitions for octopus that I've seen before include "Sea creature - pulpo on a Spanish menu" , "Far-reaching organisation" , "Long-tentacled creature" , "Sea-creature" , "Eight-limbed cephalopod" .)