Crossword Genius

Sound of angry sheep hit by off-target footballer? (8)

Ross

I believe the answer is:

crossbar

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

'sound' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'angry sheep hit by off-target footballer?' is the wordplay.
I cannot really understand how this works, but
'angry' could be 'cross' (cross can mean annoyed or angry) and 'cross' is found within the answer.
The remaining letters 'bar' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'of' acts as a link.

Can you help me to learn more?

(Other definitions for crossbar that I've seen before include "Part of bicycle or goal" , "what one may tip over?" , "Helps to define the goal" , "Horizontal part of a goal" , "Top football goal" .)

I've seen this clue in the Sydney Morning Herald.
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