What does the cryptic crossword clue "... work by Richard Strauss perhaps, one in odd tempo (4,4)" mean?

The definition is "... work". The wordplay uses an anagram. anagram of ONE + TEMPO = TONEPOEM; definition: "... work" The answer is TONEPOEM.

... work by Richard Strauss perhaps, one in odd tempo (4,4)

Daily Mail Cryptic #16374 | 29 Across | 2020-08-05 flower