Crossword Genius

Water supply needed by land near building -- large increase (11)

Ross

I believe the answer is:

groundswell

'large increase' is the definition.
(increase in popular opinion)

'water supply needed by land near building' is the wordplay.
'water supply' becomes 'well' (a well is a source of water).
'needed by' means one lot of letters go next to another.
'land near building' becomes 'grounds' (area around a building).
'well' after 'grounds' is 'GROUNDSWELL'.

(Other definitions for groundswell that I've seen before include "Forming opinion" , "that might make waves" , "gathering movement" , "Build-up of public opinion" , "pressure of public opinion" .)

I've seen this clue in The Telegraph.
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