Crossword Genius

Commit foul — dismissed before full time (6)

Ross

I believe the answer is:

offend

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'commit' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for offend that I've seen before include "Affront - break the law" , "Cause displeasure or hurt, be nasty towards" , "Hurt someone's feelings" , "tread on someone's toes?" , "Insult - act criminally" .)

I've seen this clue in The Guardian.
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