Blast husband going to choose dental accessory (9)
I believe the answer is:
toothpick
'dental accessory' is the definition.
(I've seen this before)
'blast husband going to choose' is the wordplay.
'blast' becomes 'toot' (blast on a trumpet).
'husband going' becomes 'h' (I've seen this in other clues).
'to choose' becomes 'pick' (picking is a kind of choosing).
'toot'+'h'+'pick'='TOOTHPICK'
(Other definitions for toothpick that I've seen before include "Sliver of wood for removing food fragments from mouth" , "Mouth-cleaning device" , "Thin piece of wood" , "After dinner stick" , "Dental accessory" .)