Boxer, British one, finding reason not to charge? (5)

I believe the answer is:

alibi

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'reason not to charge?' is the definition.
I can't judge whether this defines the answer.

'boxer british one' is the wordplay.
'boxer' becomes 'Ali' (Muhammad Ali).
'british' becomes 'b' (abbreviation e.g. in BBC).
'one' becomes 'i' (Roman numeral).
'ali'+'b'+'i'='ALIBI'

'finding' acts as a link.

Can you help me to learn more?

(Other definitions for alibi that I've seen before include "It shows one wasn't at crime scene" , ""suspect's story"" , "Timely excuse" , "Pretext; court excuse" , "Making excuse" .)

I've seen this clue in The Times.

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