A leading spot for renouncing spinsterhood (5)

I believe the answer is:

altar

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for altar that I've seen before include "Church focus for ritual" , "A ceremonial table for worshipping" , "Communion table" , "Focus of church worship" , "Place for sacrifices" .)

I've seen this clue in The Irish Independent.

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