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I am not sure what you mean when you ask what are the clauses.... but essentially if this is a fixed term lease then you cannot get out of it as it is a binding contract.
The landlord can sue you for the rent for the full term of the contract.
At the same time the landlord has a duty to mitigate damages and that means the landlord must take all reasonable steps to find a new tenant and if the landlord is able to do so then when that happens you will then be off the hook and will only be liable for the losses, if any, that the landlord suffered.
I am sorry this is not the answer you were hoping to hear.