Gaining usable pieces, now and then, for yearly publication (6)
I believe the answer is:
annual
'yearly publication' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for annual that I've seen before include "Once a year, perhaps a book" , "Twelve-monthly" , "plant > book" , "Coming once a year" , "Every twelve months" .)