Notching another entry in one's record as a thief? (7)

I believe the answer is:
nicking
'notching' is the definition.
The answer and definition can be both to do with contact as well as being present participle verbs.
Maybe you can see a link between them that I can't see?
'another entry in one's record as a thief?' is the wordplay.
I cannot quite see how this works, but
'in' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for nicking that I've seen is " Stealing".)
