Parasites, unknown number, spot host (8)

I believe the answer is:

licensee

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'host' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'parasites unknown number spot' is the wordplay.
'parasites' becomes 'lice' (I've seen this before).
'unknown number' becomes 'n'.
'spot' becomes 'see' (I've seen this before).
'lice'+'n'+'see'='LICENSEE'

Can you help me to learn more?

(Other definitions for licensee that I've seen before include "One authorised to sell alcohol" , "The one holding official permission" , "Person permitted to run pub" , "One allowed to sell alcohol" , "Person allowed to sell drink" .)

I've seen this clue in The Telegraph.

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