What does the cryptic crossword clue "NASA boffin is on test cricket ground (6,9)" mean?

The wordplay uses an anagram. anagram of IS + ON + TEST + CRICKET = ROCKETSCIENTIST The answer is ROCKETSCIENTIST.

NASA boffin is on test cricket ground (6,9)

Daily Mail Cryptic #16280 | 1 Down | 2020-03-26 flower