Cryptic crossword clue
Water supply needed by land near building — large increase 11

The most common and most likely answer to this crossword clue is the 11 letter word GROUNDSWELL

I've seen this crossword clue in The Daily Telegraph
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Buddy explains!

The straight part
We know that "large increase" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case large increase = groundswell.
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 GROUNDSWELL mean?

GROUNDSWELL noun
  1. A broad undulation of the open ocean, often as the result of a distant disturbance
  2. (by extension) A broadly-based shifting of public opinion

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