Crossword Genius

Tentatively schedule antibiotic I left out (in different places) (6,2)

Ross

I believe the answer is:

pencil in

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

'tentatively schedule antibiotic i left' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'in different places' is the wordplay.
I cannot quite understand how this works, but
'in' is found in the answer.
The remaining letters 'pencil' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'out' is the link.

Can you help me to learn more?

(Other definitions for pencil in that I've seen before include "Provisionally schedule" , "Provisionally reserve" .)

I've seen this clue in The Independent.
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