Wind’s double force in the end (5)
I believe the answer is:
twine
'wind's' is the definition.
(to twine is to curl or wind around)
'double force in the end' is the wordplay.
'double' becomes 'twin' (twin can mean someone's double).
'in the end' says to take the final letters.
The final letter of 'force' is 'e'.
'twin'+'e'='TWINE'
(Other definitions for twine that I've seen before include "Strong thread or string" , "Tough string" , "twist" , "Twisted cord" , "can get into knots" .)