20 across
Old
maid
and
spider?
(8)
Old maid and spider? (8)
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The whole clue is the definition (& lit or double definition).
How the clue works
The first half, Old maid, is the familiar meaning of SPINSTER as an unmarried woman. The second half, spider?, playfully points to the literal sense of a spinster as one who spins, like a web-spinning spider.