The transformation is 10A (three words), which suggests the other unclued lights, including one of two words and one hyphened.
Across
1 Similar object I really change (8)
6 Hot dog including everything (6, two words)
12 Duck, bloody, that is sent back (5)
13 Bending law welcomed by fellow in government (7)
15 Make obscure study about religious object (6)
16 Journalist to cook tuber (4)
20 In Italy, love to catch contest in Highland resort (8)
22 Escape with home’s ancient candlesticks (7)
25 Funny game with maiden over (3)
27 Partake of repast with nothing odd...

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