The gash above it is from a blow (8)

I believe the answer is:

uppercut

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'a blow' is the definition.
(I know that uppercut is a type of blow)

I don't understand how the rest of the clue works.

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(Other definitions for uppercut that I've seen before include "Punch to opponent's chin from below" , "Swinging blow from below aimed at an opponent's chin" , "Boxing punch delivered vertically" , "one must take it on the chin" , "Boxing blow delivered to chin from below" .)

I've seen this clue in the Evening Standard.

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