Cure worker that is eating small amount (8)
I believe the answer is:
antidote
'cure' is the definition.
(I know that antidote is a type of cure)
'worker that is eating small amount' is the wordplay.
'worker' becomes 'ant' (worker is a type of ant).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'eating' means one lot of letters goes inside another.
'small amount' becomes 'dot' (I can't explain this - if you can you should give a lot more credence to this answer).
'ie' placed around 'dot' is 'idote'.
'ant'+'idote'='ANTIDOTE'
Can you help me to learn more?
(Other definitions for antidote that I've seen before include "Counter to a poison" , "A remedy for poison (8)." , "It counteracts poison" , "simple remedy" , "Medicine to counteract poison" .)