Answer:
Sure, here are the letters corresponding to the clues:
- To make fun of in a playful or unkind way: TEASES → E, S
- To rise to one's feet: STANDS → T, S, A, N, D, S
- A female relative: AUNT → U, N, T
- To be in want of: NEEDS → E, D, S
- To be present at: ATTEND → A, T, T, E, N, D
- Fille plus file: DATA → A, T
- An exam: TEST → E, S, T
- Earth's Source of energy: SUN → S, U, N
Putting all the letters together, we have: E, S, T, A, N, D, S, U, N, T, E, D, S, A, T, E, N, D, S, U, N, S, T.