The most common and most likely answer to this crossword clue is the 14 letter word UNSATISFACTORY
I've seen this crossword clue in The Sunday Telegraph
U
N
S
A
T
I
S
F
A
C
T
O
R
Y
More clues leading to the result UNSATISFACTORY
- USA isn't perturbed over plant? That's poor
- Mediocre university student initially works about half the weekend
- Poor saint, moving among us, works
- Plant holding up broken units as not good enough
- It’s fun, say, but wrong, sandwiching player — not OK
- Weak plant put under sun as it moved around
- Lousy and ill-fitting caftan? It’s yours
- Poor plant placed under sun as it withered
Buddy explains!
The straight part
We know that "Weak" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case weak = unsatisfactory.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 UNSATISFACTORY mean?
UNSATISFACTORY adjective- Inadequate, substandard or not satisfactory