The most common and most likely answer to this crossword clue is the 7 letter word OILSKIN
I've seen this crossword clue in The Guardian
O
I
L
S
K
I
N
More clues leading to the result OILSKIN
- What keeps out water from paintings by family members
- Waterproof paints with ink ground
- Three-fifths of linen is OK for swimming, as waterproof
- Waterproof material used to paint family
- Crude film that’s about a sailor
- Nicking case of liqueurs, pleb in raincoat
- A part of soil’s kind of waterproof
- Use suntan lotion? It can also help in the rain
- Paints family in fisherman’s clothing
- Bribes relatives as protection
Buddy explains!

The straight part
We know that "It can also help in the rain" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it can also help in the rain = oilskin.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 OILSKIN mean?
OILSKIN noun- Cloth made from cotton and treated with oil and pigment to make it waterproof.
- A raincoat made from cotton fabric treated with oil and pigment to make it waterproof.
- (by extension) Foul-weather gear worn by sailors, whether of natural or synthetic materials.