Developed from birth in US, different from US! (9)
I believe the answer is:
unbritish
'different from us' is the definition.
(different from us in the UK)
'developed from birth in us' is the wordplay.
'developed from' indicates an anagram.
'birth'+'in'+'us'='birthinus'
'birthinus' is an anagram of 'UNBRITISH'.
I've seen this clue in The Times.
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