Part of the shoe’s damaged? Blow! (8)
I believe the answer is:
uppercut
'blow' is the definition.
(uppercut is a kind of blow)
'part of the shoe's damaged?' is the wordplay.
I cannot really see how this works, but
'part' could be 'upper' (upper is a kind of part) and 'upper' is present in the answer.
The remaining letters 'cut' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for uppercut that I've seen before include "one must take it on the chin" , "Swinging blow directed at an opponent's chin" , "Boxing blow delivered to chin from below" , "Swinging blow in boxing" , "A vertical punch to chin delivered by boxer" .)