Crossword Genius

Chap I have going round America is having an effect (9)

Ross

I believe the answer is:

causative

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'having an effect' is the definition.
I can't judge whether this definition defines the answer.

'chap i have going round america' is the wordplay.
'chap' becomes 'cat' (I've seen this in other clues).
'i have' becomes 'I've' (contraction of 'I have').
'going round' is an insertion indicator (some letters go around others).
'america' becomes 'usa' (United States of America).
'cat'+'ive'='cative'
'cative' placed around 'usa' is 'CAUSATIVE'.

'is' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.
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