The most common and most likely answer to this crossword clue is the 7 letter word SCRAPPY
I've seen this crossword clue in The Guardian
S
C
R
A
P
P
Y
Buddy explains!

The straight part
We know that "Poorly assembled/Poorly assembled" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case poorly assembled/poorly assembled = scrappy.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 SCRAPPY mean?
SCRAPPY adjective- Consisting of scraps; fragmentary; lacking unity or consistency.
- Having an aggressive spirit; inclined to fight or strive.
- (Of a fight) characterised by lots of ungainly or wild punches, grabs, wrestling, etc.
- (Of a sports match) characterised by awkward or clumsy play.