‘1/5/28’ (five words in total) is part of a quotation in ODQ and suggests how to find the common element in the remaining unclued lights (41 is in Collins). The author’s surname (6) will appear in the completed grid and must be shaded.
 

Across

 
9    Fling blue ring away (3)
11    Vase containing curious coin depicting mythical beast (7)
12    Fruit’s core in wooden dish (6)
13    Thrilling effect of flaky lemon tart (9)
14    Bacon sons eat sparingly (5)
16    Child cheers about seventy rabbits and songbirds (5)
19    I separate and remove lively lion always bounding (7)
21    Blue article with quality rolled gold (4)
24    Commander pressing...