The unclued lights (two of two words) be paired and are linked by an anagram of the four letters in the yellow squares. Brewer verifies the theme.
Across
1 No stamp confused Pat. Could be him! (7)
6 Optical expert’s endless worry returning item for camera (7)
12 Gave notice of danger of now withdrawn chemical by the sea (7)
14 Disturbances in Stroud not so regularly (5, hyphened)
15 Little men on the front row (5)
16 Bad criminal having time in ancient Greek city (6)
17 Way to anticipate enormous sadness (6)
19 Could be...

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