What does the cryptic crossword clue "Polymer is backing lithium and carbon unit (8)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Polymer is backing lithium and carbon unit (8)

Daily Mail Cryptic #16929 | 29 Across | 2022-09-21

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