Sample from tesla plant (6)
I believe the answer is:
taster
'sample' is the definition.
(thesaurus)
'tesla plant' is the wordplay.
'tesla' becomes 't' (scientific unit).
'plant' becomes 'aster'.
't'+'aster'='TASTER'
'from' is the link.
(Other definitions for taster that I've seen before include "One samples" , "Small sample" , "A sample to try" , "Brief sample" , "Sample intended to stimulate interest" .)