15 Across, More than one symbol is punctured by hollow (6) I?E?T?
25 Across, Spooner's to suggest ice-skating venue, being sentimental (4-4)
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9 Down, One instructs soldiers to retreat at the outset (6) ?E?T?R
16 Down, Online purchases mostly expensive, cropping up without credit (1-7) ?-T?C?E??