You can register with a number of agencies who are contracted to supply temporary staff for the University:
For ancillary (catering, cleaning etc) opportunities
For office administration and ancillary (catering, cleaning etc) opportunities
For office administration opportunities
For office administration and ancillary (catering, cleaning etc) opportunities
Details of fixed term contract opportunities can be found in the main job listing.
You can contact the relevant academic department directly for details of any part-time teaching opportunities.
The University's Careers Service JobShop has many term-time and vacation job opportunities for students.