Fancy man turned quiet (5)
I believe the answer is:
flash
'fancy' is the definition.
(flash can mean special or ostentatious)
'man turned quiet' is the wordplay.
'man' becomes 'alf' (short for Alfred).
'turned' shows that the letters should be reversed in order.
'quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'alf' in reverse letter order is 'fla'.
'fla'+'sh'='FLASH'
(Other definitions for flash that I've seen before include "Camera fitment" , "type of photography" , "Briefly shine, short flood" , "Conspicuously display" , "short space of time" .)