Extract largely employed making ink initially (5)
I believe the answer is:
elemi
'extract' is the definition.
(I've seen this before)
'largely employed making ink initially' is the wordplay.
'largely employed making' becomes 'elem' (I am not sure about this - if you are sure you should believe this answer much more).
'initially' says to take the initial letters.
The first letter of 'ink' is 'i'.
'elem'+'i'='ELEMI'
Can you help me to learn more?
(Other definitions for elemi that I've seen before include "aromatic resin" , "Fragrant resin used as incense - Emile (anag)" , "Resinous stuff" , "Fragrant substance" , "Fragrant tree resin used as incense - I'm Lee (anag)" .)