Spy on party for Government Ombudsman
I believe the answer is:
watchdog
'ombudsman' is the definition.
(I've seen this before)
'spy on party for government' is the wordplay.
'spy on' becomes 'watch' (I am not sure about this - if you are sure you should believe this answer much more).
'party' becomes 'do' (do is a kind of party).
'for' means one lot of letters go next to another.
'government' becomes 'g'.
'watch'+'do'+'g'='WATCHDOG'
Can you help me to learn more?
(Other definitions for watchdog that I've seen before include "Ombudsman" , "Monitoring organisation" , "Person or canine acting as guardian" , "TV consumer programme" , "protector" .)