High flyer is buying limousine, say, for all (6)
I believe the answer is:
icarus
'high flyer' is the definition.
(Icarus flew too close to the sun in Greek myth)
'is buying limousine say for all' is the wordplay.
'buying' indicates putting letters inside (inserted letters are acquired or 'bought').
'limousine say' becomes 'car' (limousine is a type of car).
'for all' becomes 'U' (Universal film certificate - suitable for all).
'car'+'u'='caru'
'is' placed around 'caru' is 'ICARUS'.
(Other definitions for icarus that I've seen before include "Mythological figure who died when the sun melted the wax on his wings" , "His wings melted when he flew too near the sun" , "Son of Daedalus, who flew too close to the sun" , "Ancient Greek who flew so high his wings melted" , "Ill-fated flier of myth" .)