Philanthropist given brief reprimand — declined to meet the Queen (11)
I believe the answer is:
rockefeller
'philanthropist' is the definition.
(I know that Rockefeller is a philanthropist)
'brief reprimand declined to meet the queen' is the wordplay.
'brief' means to remove the last letter (a shorter or briefer version of the word).
'reprimand' becomes 'rocket' (rocket can mean to reprimand or criticise).
'declined' becomes 'fell' (I've seen this in another clue).
'to meet' is a charade indicator (letters next to each other).
'the queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'rocket' with its final letter removed is 'rocke'.
'rocke'+'fell'+'er'='ROCKEFELLER'
'given' is the link.
(Other definitions for rockefeller that I've seen before include "who made millions" , "US oil magnate and philanthropist, d. 1937" , "Nelson __ , Gerald Ford's vice president" , "US oil tycoon and philanthropist" , "John D. --, US millionaire and philanthropist" .)