Cryptic crossword clue
This’ll help protect a house with rot mounting around her 15

The most common and most likely answer to this crossword clue is the 15 letter word WEATHERBOARDING

I've seen this crossword clue in Financial Times
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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 WEATHERBOARDING mean?

WEATHERBOARDING noun
  1. A type of wooden siding in which a house is sided with long, thin, overlapping boards.

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