Might we need this one as pot boils? (8)
I believe the answer is:
teaspoon
'might we need this one as pot boils?' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'one as pot boils?' is the wordplay.
'boils?' indicates an anagram (I've seen 'boiling' mean this).
'one'+'as'+'pot'='oneaspot'
'oneaspot' is an anagram of 'TEASPOON'.
(Other definitions for teaspoon that I've seen before include "Kitchen utensil able to hold about one fluid dram" , "Small piece of cutlery" , "Small item of cutlery (8)" , "It creates a stir" , "which causes a stir!" .)