Part of core curriculum to come round again (5)
I believe the answer is:
recur
'come round again' is the definition.
(thesaurus)
'part of core curriculum to' is the wordplay.
'part of' says the answer is hidden in the clue.
'RECUR' is hidden in the letters of 'core curriculum to'.
(Other definitions for recur that I've seen before include "Come round again" , "Repeat" , "expected to return" , "Perseverate" , "come back to one's mind" .)