Answer request for help to acquire highest quality insulating material (8)

Independent Cryptic #11610 | 21 Across | 2023-12-27
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I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Answer request for help to acquire highest quality insulating material BEST (=highest quality) in [A (=answer, as in Q&A) + SOS (=request for help)]

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