One page is rewritten in work relying on intelligence (9)

I believe the answer is:
espionage
'intelligence' is the definition.
(espionage is a kind of intelligence)
'one page is rewritten' is the wordplay.
'rewritten' indicates anagramming the letters.
'one'+'page'+'is'='onepageis'
'onepageis' is an anagram of 'ESPIONAGE'.
'in work relying on' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for espionage that I've seen before include "undercover work" , "agent's job" , "hush-hush work" , "007's game" , "Practice of spying" .)
