Unforgettable interns should make it (5)
I believe the answer is:
forge
'it' is the definition.
The definition suggests a singular noun which matches the answer.
'unforgettable interns should' is the wordplay.
'FORGE' is hidden in amongst the letters.
However, I am not sure how the hidden word is indicated.
'make' is the link.
Can you help me to learn more?
(Other definitions for forge that I've seen before include "Smithy; falsify" , "Fabricate" , "Counterfeit - smithy" , "Shape by heating and hammering, as smith does" , "Furnace for heating metal" .)