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Last clue 40d build-up( of feeling or opinion) 11 ltrs
?r?u?d?w?l? (Groundswell? )

Looks good to me.


groundswell
[ground-swel]

Examples
Word Origin

noun
1.
a broad, deep swell or rolling of the sea, due to a distant storm or gale.
2.
any surge of support, approval, or enthusiasm, especially among the general public:

Here's a better example.

groundswell
ˈɡraʊn(d)ˌswɛl/
noun
noun: groundswell; plural noun: groundswells

1.
an increase in a particular opinion among a large section of the population.
"a groundswell of opposition developed"
2.
a large or extensive swell in the sea.

Thanks shooty, for support.