What does the cryptic crossword clue "First phase of Stone Age building (5,3)" 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.

First phase of Stone Age building (5,3)

Guardian Cryptic #26945 | 25 Across | 2016-07-25 flower

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