What does the cryptic crossword clue "Not all there, unlikely granny will return diamond (6)" 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.

Not all there, unlikely granny will return diamond (6)

Guardian Cryptic #29852 | 27 Across | 2025-11-14 flower

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