Dm 15052

[alanogden]

The crossword was very difficult today and after a struggle I'm left with one to solve; 20A Just introduce the soprano secretly (2,3,3) I've got O?T?E?L?

[retrocop]

on the sly

[roslyn251254]

on the sly?

[scorpiojo]

On the S ly

[dannyk13]

On the sly

[alanogden]

Thanks for those suggestions, so speedy! Can someone explain the answer?

[dannyk13]

the + s(soprano) inside only(just)

[alanogden]

Many thanks for that explanation - is 'S' for soprano acceptable, I don't like those single letter parts of answers. I thought it might be something to do with Sylvester Stallone!