‘21D/14’ (four words in total) is an instruction (in ODQ) with which solvers will comply by inserting the remaining unclued lights. The source of the instruction will appear diagonally in the completed grid and must be shaded.
Across
1 Brand of amplifier adopted by meetings (7)
5 Electronic device university dumped (obsolete calculator) (7)
9 Giant devoured no Australian (4)
11 Mental case atop very Scottish plants and trees (10)
17 First among toreadors spots bull (5)
18 Maybe Sackville-West carries the oil container (5)
20 Corrupt district repelled oxygen supplier (7)
21 Criminal is...

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