In March 1928 Clausen, now Sir George, co-signed a letter from the British Confederation of Arts to Sir William Clark, Comptroller General of the Department of Overseas Trade, urging the British government to take over the ill-managed and inadequately-funded British Pavilion, Sala Inglese (opened in 1909), at the Biennale – which it did in 1932 (it is still under The British Council). It argued that the situation in Venice was
not creditable either to British Art or, what may well be more important, to British prestige and our relations with Italy in general. When in every gallery Ministers of the different nations to which they belong are waiting to receive the visit of the King of Italy, it seems unfortunate, to say the least, that in our Pavilion alone some make-shift arrangement is all that can be effected.
What was undoubtedly more important! The other signatories (not necessarily in this order) were painters, Lavery, Dicksee, Orpen, Ricketts, Shannon, Augustus John, Fry, Tonks, Rothenstein, Holmes; a sculptor, Dobson; architects, Sir Herbert Baker and Sir Giles Gilbert Scott; and George Bernard Shaw. See Bowness and Philpot, op cit.
The only depiction of Venice by GC that I know of is a slight drawing of the Rialto bridge at the Royal Academy, apparently dated May 1908 (most of the thousand or so drawings they hold are slight), perhaps done on an Art Workers Guild holiday.