Crossword Genius

Dad's initial contribution that might be counted in performance assessment? (5)

Ross

I believe the answer is:

sperm

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'dad's' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'initial contribution that might be counted in performance assessment?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

Can you help me to learn more?

(Other definitions for sperm that I've seen before include "Male reproductive cell" , "Semen" .)

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