What does the cryptic crossword clue ""An Englishman in New York" from Elton? Nonsense! (4,4)" mean?

The wordplay uses a charade (building blocks). JOHN (synonym="JOHN") + BULL (synonym="BULL") = JOHNBULL The answer is JOHNBULL.

"An Englishman in New York" from Elton? Nonsense! (4,4)

Guardian Cryptic #26288 | 5 Across | 2014-06-17 flower