Imposing jiujitsu — guards to mount displays (6)
I believe the answer is:
august
'imposing' is the definition.
(I've seen this before)
'jiujitsu guards to mount displays' is the wordplay.
'displays' says the answer is hidden in the clue.
'to mount' is a reversal indicator (I've seen 'mounted' mean this).
'tsugua' is hidden within 'jiujitsu guards'.
'tsugua' reversed gives 'AUGUST'.
(Other definitions for august that I've seen before include "which is supposedly hot" , "there's not much of it left now [27 AUGUST]" , "nomination for Strindberg" , "a period for taking holidays?" , "Inspiring respect and admiration" .)