Plenty of blocks (4)
I believe the answer is:
lots
This clue might be a double definition.
'plenty' is the first definition.
(I've seen this before)
'blocks' is the second definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe there's an association between them I don't understand?
'of' is the link.
Can you help me to learn more?
(Other definitions for lots that I've seen before include "Units sold at auctions - plenty of them" , "Something to draw" , "Oodles" , "may be drawn" , "Loads" .)