Tackle electronic toy (4)
I believe the answer is:
kite
'toy' is the definition.
(kite is a kind of toy)
'tackle electronic' is the wordplay.
'tackle' becomes 'kit' (both can mean gear or equipment).
'electronic' becomes 'e' (as in e-mail or e-books).
'kit'+'e'='KITE'
(Other definitions for kite that I've seen before include "Quadrilateral; bird" , "Hawk-like bird" , "It flies with string attached" , "Kind of toy flown on string" , "Child's toy; bird of prey" .)