Crossword Genius

One baseballer in the jug? (7)

Ross

I believe the answer is:

pitcher

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

'the jug?' is the definition.
(I've seen this before)

'one baseballer' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'er' (I've seen this in other clues) and 'er' is found within the answer.
The remaining letters 'pitch' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

'in' acts as a link.

Can you help me to learn more?

(Other definitions for pitcher that I've seen before include "One throwing" , "able to hold a lot of beer" , "Ewer" , "Vessel with a handle and spout" , "one getting walked all over?" .)

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