What does the cryptic crossword clue "Quicksilver mostly lies all over the place? (5)" mean?

The definition is "Quick". The wordplay uses an anagram. anagram of AG (synonym="silver") + LIE (synonym="LIE") = AGILE The answer is AGILE.

Quicksilver mostly lies all over the place? (5)

Guardian Cryptic #29419 | 26 Across | 2024-06-26 flower