For one, Bond Street befouled with eg, can (6,5)
I believe the answer is:
secret agent
'for one bond' is the definition.
I can't judge whether this defines the answer.
'street befouled with eg can' is the wordplay.
'befouled with' indicates anagramming the letters.
'eg'+'can'='egcan'
'street' mixed up with 'egcan' gives 'SECRET AGENT'.
Can you help me to learn more?
(Other definitions for secret agent that I've seen before include "Conrad character" , "Spy" , "007 - centre stage (anag)" .)