Crossword Genius

Kate and Bill are people with intelligence (6)

Ross

I believe the answer is:

mossad

I'm a little stuck... Click here to teach me more about this clue!

'intelligence' is the definition.
(I know that Mossad is a type of international intelligence agency)

'kate and bill are people' is the wordplay.
I cannot really understand how this works, but
'bill' could be 'ad' (advertisement stuck on wall) and 'ad' is found in the answer.
The remaining letters 'moss' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'with' is the link.

Can you help me to learn more?

(Other definitions for mossad that I've seen before include "Israeli intelligence organisation" , "Israeli intelligence service" , "Agents" , "Israeli intelligence agency" , "Israeli secret service" .)

I've seen this clue in The Independent.
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