This America has its uncle (3)

I believe the answer is:

sam

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

'uncle' is the definition.
(Uncle Sam is an example)

'this america has' is the wordplay.
'has' indicates the answer is hidden within the clue.
'SAM' can be found hidden inside 'this america'.

'its' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for sam that I've seen before include "together once" , "Casablanca piano player" , "Uncle" , "Boy" .)

I've seen this clue in The Mirror.

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