The most common and most likely answer to this crossword clue is the 7 letter word DRIZZLE
I've seen this crossword clue in The Guardian
D
R
I
Z
Z
L
E
Buddy explains!

The straight part
We know that "Poor weather/Poor weather" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case poor weather/poor weather = drizzle.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 DRIZZLE mean?
DRIZZLE noun- Light rain.
- Very small, numerous, and uniformly dispersed water drops, mist, or sprinkle. Unlike fog droplets, drizzle falls to the ground.
- Water.
- A cake onto which icing, honey or syrup has been drizzled in an artistic manner.
- To rain lightly.
- To shed slowly in minute drops or particles.
- To pour slowly and evenly, especially oil or honey in cooking.
- To cover by pouring in this manner.
- To urinate.
- To carry out parfilage, the process of unravelling.