Trick inconsequential, by the sound of it? (7)
I believe the answer is:
sleight
'trick' is the definition.
(I've seen this in another clue)
'inconsequential by the sound of it?' is the wordplay.
'inconsequential' becomes 'slight'.
'by the sound of it?' indicates a 'sounds like' (homophone) clue.
'slight' is a homophone of 'SLEIGHT'.
(Other definitions for sleight that I've seen before include "Trickery" , "distraction?" , "craft" , "Handy skill" , "Hits leg (anag) - cunning" .)