Visit American relative at home (3,2)

I believe the answer is:

pop in

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'visit' is the definition.
(thesaurus)

'american relative at home' is the wordplay.
'american relative' becomes 'pop' (pop is a kind of relative. I am not sure about the 'american' bit.**).
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'pop'+'in'='POP IN'

Can you help me to learn more?

(Other definitions for pop in that I've seen before include "Pay a quick informal visit" , "Visit briefly" , "Call" .)

I've seen this clue in The Telegraph.

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