Crossword Genius

Not so much to consecrate in bishop’s absence (4)

Ross

I believe the answer is:

less

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'not so much' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for less that I've seen before include "minor" , "Smaller in amout or degree" , "Fewer; minus" , "Comparatively little" , "Minus; not so much" .)

I've seen this clue in The Times.
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