Professional US magazine, highly esteemed, grew rapidly (12)
I believe the answer is:
proliferated
'grew rapidly' is the definition.
('proliferate' can be a synonym of 'grow rapidly')
'professional us magazine highly esteemed' is the wordplay.
'professional' becomes 'pro' ('pro' can be a synonym of 'professional').
'us magazine' becomes 'life'.
'highly esteemed' becomes 'rated'.
'pro'+'life'+'rated'='PROLIFERATED'
I've seen this clue in The Telegraph.
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