Floor assistants delivered for many years (7)
I believe the answer is:
decades
'many years' is the definition.
(I've seen this in another clue)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for decades that I've seen before include "10-year periods" , "Ten-year spells" , "Ten year periods" , "Periods of 10 years" .)