A material to be created - whenever! (2,4)
I believe the answer is:
at will
'be created whenever' is the definition.
I can't tell whether this definition defines the answer.
'a material' is the wordplay.
'material' becomes 'twill' (twill is a kind of material).
'a'+'twill'='AT WILL'
'to' is the link.
Can you help me to learn more?
(Other definitions for at will that I've seen before include "As one chooses" , "Whenever one wishes" , "Whenever one pleases, own choice" , "Whenever one pleases, say fire rifle" , "whenever you want" .)