Something healing scientist drops first (6)

I believe the answer is:

physic

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

'drops first' is the definition.
'physic' can be an answer for 'drops' (thesaurus). I am not certain of the 'first' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for physic that I've seen before include "Purgative medicine" , "Informal medicine" , "Art of healing" , "An unusual medicine is the answer" , "Wholesome" .)

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