Crossword Genius

Unusually, perhaps, notice bishop replacing centrepiece of altar (6)

Ross

I believe the answer is:

adverb

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'unusually perhaps notice' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for adverb that I've seen before include "Verb qualifier" , "It qualifies the predicate in a sentence" , "Word such as 'madly'" , "unwisely, for example" , "Word that qualifies another" .)

I've seen this clue in The Independent.
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