After dinner deliberately injured some bore (4)

I believe the answer is:

nerd

I'm a little stuck... Click here to teach me more about this clue!

'some bore' is the definition.
(both can mean a boring person)

'after dinner deliberately injured' is the wordplay.
'NERD' is hidden within the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for nerd that I've seen before include "Anorak (informal)" , "Boring person" , "Irritating person (slang)" , "Someone boring (about computers?)" , "Flag on poles; wide (headline)" .)

I've seen this clue in the Sydney Morning Herald.

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