The unclued lights, two of two words, are of a kind. Elsewhere, ignore an apostrophe.

Across

1 We hear eldest son refrains from claiming media for media (8)
6 Insectivore collected nectar (6)
11 Mostly, robbery’s extremely unusual in the whole passage (10)
13 Came across investment vehicle with nothing in (5)
14 Books with titles always found in literature (8)
17 Breaks in Ireland take up time … seconds (7)
18 Greek restaurant upset one on the subject of sales tax (7)
19...