Cooler passenger to flourish (7)
I believe the answer is:
fanfare
'flourish' is the definition.
(thesaurus)
'cooler passenger' is the wordplay.
'cooler' becomes 'fan' (I've seen this before).
'passenger' becomes 'fare' (fare is a kind of passenger).
'fan'+'fare'='FANFARE'
'to' is the link.
(Other definitions for fanfare that I've seen before include "Short piece of music played on brass instruments (for the Common Man?)" , "Flourish of trumpets" , "Naff era (anag)" , "Ceremonious sounding of trumpets" , "Trumpet call" .)