Show some flashiness? (5)
I believe the answer is:
shine
'show' is the definition.
(thesaurus)
'some flashiness?' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'SHINE' is hidden in the letters of 'flashiness'.
(Other definitions for shine that I've seen before include "Lustre" , "Radiate or excel" , "Direct (a torch) somewhere" , "Glint" , "Glimmer" .)