Millions admire wonderfully legless lady (7)
I believe the answer is:
mermaid
'wonderfully legless lady' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'millions admire' is the wordplay.
I cannot quite see how this works, but
'millions' could be 'm' (abbreviation) and 'm' is present in the answer.
an anagram of 'admire' is 'ermaid' which is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for mermaid that I've seen before include "siren" , "Fabulous woman" , "Mythical swimmer" , "Woman with tail of fish" , "London theatre?" .)