A beast to snoop around on another's behalf (5)

I believe the answer is:

proxy

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'another's behalf' is the definition.
I can't judge whether this definition defines the answer.

'a beast to snoop around' is the wordplay.
'a beast' becomes 'ox'.
'to snoop' becomes 'pry' (I've seen this before).
'around' means one lot of letters goes inside another.
'ox' put within 'pry' is 'PROXY'.

'on' is the link.

Can you help me to learn more?

(Other definitions for proxy that I've seen before include "Authorised substitution" , "Stand-in, agent" , "Authorised agent" , "Stand in" , "authoritative document" .)

I've seen this clue in the Evening Standard.

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