What Remainer will do for example, eating tons? (4)
I believe the answer is:
stay
'what remainer will do' is the definition.
The definition suggests a singular noun which matches the answer.
'for example eating tons?' is the wordplay.
'for example' becomes 'say' ('say' can be used to introduce an example).
'eating' means one lot of letters goes inside another.
'tons?' becomes 't'.
'say' going around 't' is 'STAY'.
Can you help me to learn more?
(Other definitions for stay that I've seen before include "Board; continue" , "Guy rope" , "remain in the same place" , "Supporting rope or wire" , "Reside" .)