Hardly bust - missing last incisions (7)
I believe the answer is:
notches
'incisions' is the definition.
('notch' can be a synonym of 'incision')
'hardly bust missing last' is the wordplay.
'hardly' becomes 'not' (I've seen this in another clue).
'bust' becomes 'chest' (I've seen this before).
'missing last' means to remove the last letter.
'chest' with its last letter taken off is 'ches'.
'not'+'ches'='NOTCHES'
(Other definitions for notches that I've seen before include "Makes small indentation in" , "V-Shaped cuts or indentations" , "Nicks" , "Small v-shaped cuts" , "Small indentations found on chest" .)