Around ten persons were injured in the violence.
Trouble began around noon when the lawyers blocked traffic on the busy Allahabad-Kanpur road in protest against the alleged assault on some lawyers two days ago, said Mritunjay Mishra, media cell in-charge of the district police.
Mishra said the advocates alleged that some Samajwadi Party leaders were behind the assault and demanded their immediate arrest.
The students asked the protesting lawyers to clear the road for their procession which the latter refused. This led to a clash with both sides engaging in stone-pelting.
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At least 10 persons including policemen were injured and a number of vehicles was damaged during the clash, the police spokesman said.
The spokesman said it is suspected that the woman, a fruit-seller, died of shock as she tried to flee the spot. There was no injury mark on her body, he added.