Where choppers come down, the edge splitting skulls? (8)
I believe the answer is:
helipads
'where choppers come down' is the definition.
(where helicopters land)
'edge splitting skulls?' is the wordplay.
'edge' becomes 'lip' (lip is a kind of edge).
'splitting' indicates putting letters inside (some letters split a word into two).
'skulls?' becomes 'heads' (I can't justify this - if you can you should believe this answer much more).
'lip' placed inside 'heads' is 'HELIPADS'.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for helipads that I've seen before include "where some aircraft come down" , "Areas for wingless aircraft to take off and land" .)