Copy of Henry Green taken round (4)
I believe the answer is:
echo
'copy' is the definition.
(I've seen this before)
'henry green taken round' is the wordplay.
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'green' becomes 'eco' (abbreviation for ecological).
'taken round' is an insertion indicator.
'h' put within 'eco' is 'ECHO'.
'of' is the link.
(Other definitions for echo that I've seen before include "Greek girl in love with Narcissus" , "letter we hear" , "Reverberate - nymph spurned by Narcissus" , "ring" , "Send back" .)