Pharmacists cite measures restricting return of medicines (7)

I believe the answer is:

emetics

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

'medicines' is the definition.
(emetic is a kind of medicine)

'pharmacists cite measures restricting return' is the wordplay.
'EMETICS' is hidden backwards in amongst the letters.
However, I am unsure how the hidden word is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for emetics that I've seen before include "We bring up" , "they make me vomit!" .)

I've seen this clue in The Independent.

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