In the clues, the 9 stars represent omitted words (one of which is a dialect variant of another). Those 9 words, along with 12 others which form a set, must be used to complete the 11 unclued entries, which include four two-word phrases and four hyphened words, and are all in Chambers.
Across
1 Government taken in by inhabitants — more than one lied (5)
4 Brook disappointment eventually after Malteser’s crunched (9)
11 Primate, somersaulting, ’ad something to stand on? (6)
12 Private * and expert pilot (7)
14 Prop to walk stiffly (5)
15 ...

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