A flashy way to think? (5)
I believe the answer is:
aloud
'way to think?' is the definition.
(I've seen this in another clue)
'a flashy' is the wordplay.
'flashy' becomes 'loud' (synonyms).
'a'+'loud'='ALOUD'
(Other definitions for aloud that I've seen before include "Not under breath" , "In an audible voice" , "Audibly" , "At some volume" , "Not sotto voce" .)