Maghull Labour Councillor Patrick McKinley said he will fight to ensure owners of the new wine bar in Central Square address residents' concerns.
The wine bar was given approval by Sefton Council's planning committee last week.
Sudell Ward's Cllr McKinley spoke on behalf of residents at the committee meeting.
Cllr McKinley said: "Residents who opposed the plans for the wine bar had some very valid concerns.
"These concerns included a fear that the wine bar would become a drinking den instead of a nice little place where people can go along and enjoy a quiet drink.
"The owners have ensured me that they won't let this happen but that the wine bar will be well managed and well run in the interests of the community."
Cllr McKinley said he and the Maghull Labour Action Team will work to make sure that the wine bar owners address the concerns of the residents.
Cllr McKinley said: "The planning committee were between a rock and a hard place as the Tory-Lib Dem changes to the planning laws are essentially a charter for developers and businesses, regardless of the concerns of the local community.
"The owners of the wine bar have agreed to meet regularly with the local residents to discuss concerns. Cllr Lynn Gatherer and I will both attend these meetings and make sure they adhere to their promises and address any concerns as they arise."