Indiscreet, untidy – flashy? (10)
I believe the answer is:
iridescent
'flashy?' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?
'indiscreet untidy' is the wordplay.
'untidy' is an anagram indicator.
'indiscreet' with letters rearranged gives 'IRIDESCENT'.
Can you help me to learn more?
(Other definitions for iridescent that I've seen before include "flashing colours" , "shimmering with colour" , "shot" , "Like a rainbow" , "Glittering with changing colours" .)