Accoutrements contain parts that are shocking (5)
I believe the answer is:
outre
'are shocking' is the definition.
(I've seen this before)
'accoutrements contain parts' is the wordplay.
'parts' indicates the answer is hidden within the clue (part of the clue provides the answer).
'OUTRE' is hidden in the letters of 'accoutrements contain'.
'that' acts as a link.
(Other definitions for outre that I've seen before include "Shockingly unusual" , "Shockingly unconventional" , "Unusual, rather shocking (from French)" , "Eccentric, improper" , "Extravagant - fantastic" .)