Earphones from leading group (7)
I believe the answer is:
headset
'earphones' is the definition.
(I've seen this in another clue)
'leading group' is the wordplay.
'leading' becomes 'head' (I've seen this in other clues).
'group' becomes 'set' (both can mean a collection).
'head'+'set'='HEADSET'
'from' is the link.
(Other definitions for headset that I've seen before include "Earphones and microphone assembly" , "Radio operator's equipt." , "Cans" , "Combined earphones with microphone" , "listening device" .)