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Not especially impressive batting statistic (7)

Ross

I believe the answer is:

average

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

'batting statistic' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for average that I've seen before include "Mediocre - medium" , "Medium; normal" , "Mean - ordinary" , "par" , "Mean figure?" .)

I've seen this clue in The Everyman puzzle in The Observer.
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