Wise cooks use it (4)
I believe the answer is:
sage
'wise' is the definition.
(similar in meaning)
'cooks use it' is the wordplay.
'cooks use' becomes 'sag' (I can't explain this - if you can you should give a lot more credence to this answer).
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'sag'+'e'='SAGE'
Can you help me to learn more?
(Other definitions for sage that I've seen before include "Seasoning for the wise one" , "Herb used in cooking" , "Herb; wise person" , "Learned" , "Oracle; herb" .)