What does the cryptic crossword clue "Top title's devised for an experimental aviator (4,5)" mean?

The wordplay uses an anagram. anagram of TOP + TITLE'S = TESTPILOT The answer is TESTPILOT.

Top title's devised for an experimental aviator (4,5)

Daily Mail Cryptic #17080 | 4 Down | 2023-04-20 flower