A lot of change applied to one Latin writer (6)
I believe the answer is:
pencil
'one latin writer' is the definition.
'pencil' can be an answer for 'writer' (something which writes). I'm not sure about the 'one latin' bit.
'a lot of change applied to' is the wordplay.
'a lot of' means to remove the last letter (a lot of but not all of the word).
'change' becomes 'pence' (I have seen 'Small change ' mean 'pence' so perhaps 'change' could also mean 'pence').
'applied to' becomes 'il' (I can't explain this - if you can you should give a lot more credence to this answer).
'pence' with its last letter removed is 'penc'.
'penc'+'il'='PENCIL'
Can you help me to learn more?
(Other definitions for pencil that I've seen before include "One doing boring clerical work?" , "implement in case?" , "Graphite writer" , "Writing instrument" , "Graphite stick" .)