Chemist’s brought in toothpaste urgently (7)
I believe the answer is:
pasteur
'chemist's' is the definition.
(Pasteur is an example)
'in toothpaste urgently' is the wordplay.
'in' indicates the answer is hidden within the clue.
'PASTEUR' is hidden in the letters of 'toothpaste urgently'.
'brought' acts as a link.
(Other definitions for pasteur that I've seen before include "He developed the partial sterilization of milk" , "Louis --, French chemist and microbiologist" , "French chemist and biologist (1822-1895)" , "He invented a method to stop milk causing disease" , "French scientist" .)