Green skirts hot for nymph (4)
I believe the answer is:
echo
'nymph' is the definition.
(figure of Greek myth)
'green skirts hot' is the wordplay.
'green' becomes 'eco' (abbreviation for ecological).
'skirts' indicates putting letters inside.
'hot' becomes 'h'.
'eco' going around 'h' is 'ECHO'.
'for' is the link.
(Other definitions for echo that I've seen before include "Reflected sound" , "Send back" , "Reflection of sound - Greek nymph" , "What evokes memories" , "copy" .)