The most common and most likely answer to this crossword clue is the 7 letter word PRECAST
I've seen this crossword clue in The Guardian
P
R
E
C
A
S
T
More clues leading to the result PRECAST
Buddy explains!

The straight part
We know that "“like concrete blocks”" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case “like concrete blocks” = precast.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PRECAST mean?
PRECAST noun- Structural members made of concrete, ready for installation.
- To cast in a location other than where to be installed.
- Cast previously in another location.