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Where is your partner currently and what is their nationality?
Your fiancee needs to apply for a fiancee visa, you will then need to get married within 6 months of your fiancee arriving in the UK. Once married, your fiancee will then need to apply for further leave to remain in the UK as your spouse.
See here for the application procedure and requirements: https://www.gov.uk/uk-family-visa/partner-spouse
I hope this helps. Please leave a positive rating if so.
In that case she would need to apply for leave to enter the UK as your spouse. Information in the same link I provided.
All the best