Sound reflection from Henry wearing green (4)
I believe the answer is:
echo
'sound reflection' is the definition.
(synonyms)
'henry wearing green' is the wordplay.
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'wearing' is an insertion indicator.
'green' becomes 'eco' (eco-friendly).
'h' placed into 'eco' is 'ECHO'.
'from' acts as a link.
(Other definitions for echo that I've seen before include "Reflect in Czechoslovakia" , "Imitate -- a nymph" , "In Roman mythology, the nymph who loved Narcissus" , "Return of sound waves" , "repeated answer" .)