Injure criminal with one inventor (7)

I believe the answer is:

marconi

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'inventor' is the definition.
(I've seen this before)

'injure criminal with one' is the wordplay.
'injure' becomes 'mar' (I can't justify this - if you can you should believe this answer much more).
'criminal' becomes 'con' (abbreviation for 'convict').
'with' is a charade indicator (letters next to each other).
'one' becomes 'i' (roman numeral).
'mar'+'con'+'i'='MARCONI'

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(Other definitions for marconi that I've seen before include "Radio enthusiast" , "Communications pioneer" , "Italian inventor of radio" , "Developer of radio-telegraphy" , "Developer of radio telegraphy" .)

I've seen this clue in The Hindu.

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