Medical instrument suppliers originally manufactured in grey (7)
I believe the answer is:
syringe
'medical instrument' is the definition.
(syringe is a kind of medical instrument)
'suppliers originally manufactured in grey' is the wordplay.
'originally' indicates taking the first letters.
'manufactured' indicates anagramming the letters.
The initial letter of 'suppliers' is 's'.
'in'+'grey'='ingrey'
'ingrey' anagrammed gives 'yringe'.
's'+'yringe'='SYRINGE'
(Other definitions for syringe that I've seen before include "Device for giving injections" , "Means of injection" , "Clean out (ears)" , "Medical instrument" , "Injecting device" .)