I'm a guy but for female employees: If you're not with the clique, expect to be undermined A LOT.
Let me repeat that, if you're not in the clique, expect to be undermined A LOT.
The clique will express their disapproval of you everyday till you either leave or start delivering on "their" wants and needs.
People get promoted in name only, the responsibilities are the same - the pay may come with an increase but nobody is going anywhere other than out to other firms.
There is no professional development. They talk about it in the interview but they do NOT develop nor do they really send anyone out for any development. All the work is solely focused on winning work.