a = [
{'name': 'Arsenal', 'manager': 'Mikel Arteta', 'url': 'https://site.com/clubs/1030/?from=c_london'},
{'name': 'Aston Villa', 'manager': 'Dean Smith', 'url': 'https://site.com/clubs/1040/'},
{'name': 'Brentford', 'manager': 'Thomas Frank', 'url': 'https://site.com/clubs/1050/?from=city_london'},
{'name': 'Brighton and Hove Albion', 'manager': 'Graham Potter', 'url': 'https://site.com/clubs/1020/'}
]
a = list(filter(lambda x:'?from' not in x['url'], a))
print(a)
# [{'name': 'Aston Villa', 'manager': 'Dean Smith', 'url': 'https://site.com/clubs/1040/'},
# {'name': 'Brighton and Hove Albion', 'manager': 'Graham Potter', 'url': 'https://site.com/clubs/1020/'}]