Cold lubricant for spring (4)
I believe the answer is:
coil
'for spring' is the definition.
(coil spring is a kind of spring)
'cold lubricant' is the wordplay.
'cold' becomes 'c' (eg on taps).
'lubricant' becomes 'oil' (I've seen this before).
'c'+'oil'='COIL'
(Other definitions for coil that I've seen before include "Wind round and round in loops" , "Wire winding" , "Wound length (of rope)" , "Wind (wire, rope, etc)" , "Convolute" .)