Flamboyant Alf turned bashful (6)
I believe the answer is:
flashy
'flamboyant' is the definition.
(I've seen this in another clue)
'alf turned bashful' is the wordplay.
'turned' says the letters should be written backwards.
'bashful' becomes 'shy' (bashful means shy or reserved).
'alf' back-to-front is 'fla'.
'fla'+'shy'='FLASHY'
(Other definitions for flashy that I've seen before include "Showy but empty; Has fly (anag.)" , "Flamboyantly attractive" , "Loud" , "Showily stylish" , "Garish" .)