Basic building block forming part of kettle (7)
I believe the answer is:
element
I believe this is a triple definition!
'basic' is the first definition.
(I've seen this before)
'building block' is the second definition.
(I've seen this before)
'forming' is a link.
'part of kettle' is the third definition.
'element' can be an answer for 'part' (element is a kind of part). I am not certain of the 'of kettle' bit.
Can you help me to learn more?
(Other definitions for element that I've seen before include "that's used in heating" , "Earth, water, air or fire" , "Component - factor" , "part of cooker" , "lead, for example" .)