Crossword Genius

Rogue dropping in after signs of temperature in flock (6)

Ross

I believe the answer is:

church

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'flock' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Maybe there's a link between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for church that I've seen before include "A building for Christian worship" , "Building for religious worship" , "Holy establishment" , "Place for public worship" , "Body professing common creed" .)

I've seen this clue in The Independent.
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