Hard work producing implant (5)
I believe the answer is:
graft
I believe this clue is a double definition.
'hard work' is the first definition.
(I've seen this before)
'implant' is the second definition.
(thesaurus)
'producing' acts as a link.
(Other definitions for graft that I've seen before include "Transfer of tissue - hard work!" , "Hard work - corrupt profit" , "Make money from corruption" , "Labour" , "Make parts of different plants grow together" .)