Showy rig has broken down (6)
I believe the answer is:
garish
'showy' is the definition.
(I've seen this in another clue)
'rig has broken down' is the wordplay.
'broken down' is an anagram indicator.
'rig'+'has'='righas'
'righas' with letters rearranged gives 'GARISH'.
(Other definitions for garish that I've seen before include "in bright colours" , "Tastelessly showy" , "Colourful in a vulgar manner" , "Tastelessly bright" , "Gaudy, showy" .)