Double smallest amount of electricity in coil (5)
I believe the answer is:
twine
'coil' is the definition.
(I've seen this before)
'double smallest amount of electricity' is the wordplay.
'double' becomes 'twin' (I've seen this before).
'smallest amount of' indicates taking the first letters.
The initial letter of 'electricity' is 'e'.
'twin'+'e'='TWINE'
'in' is the link.
(Other definitions for twine that I've seen before include "wind" , "Tough string" , "Garden string" , "Strong thread or string" , "Thin cord" .)