In "title," amended the L, making it small (6)
I believe the answer is:
little
'small' is the definition.
(I know that small can be written as little)
'in title amended the l' is the wordplay.
'in' means one lot of letters goes inside another.
'amended' indicates anagramming the letters.
'title' with letters rearranged gives 'litte'.
'litte' enclosing 'l' is 'LITTLE'.
'making it' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for little that I've seen before include "Piddling" , "Wee; minute" , "Minor" , "Not big, much or important" , "part of Stuart in film?" .)