A tear? (3,4)

I believe the answer is:

eye drop

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

'a tear?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'a tear?' is the wordplay.
I cannot quite see how this works, but
'tear?' could be 'drop' (I've seen this in another clue) and 'drop' is found in the answer.
The remaining letters 'eye' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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