Crossword Genius

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

Ross

I believe the answer is:

church

I'm a little stuck... Click here to teach me more about this clue!

'flock' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

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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