What does the cryptic crossword clue "Trying a VAR out could be an easy and rewarding job (5,5)" mean?

The wordplay uses an anagram. anagram of TRYING + A + VAR = GRAVYTRAIN The answer is GRAVYTRAIN.

Trying a VAR out could be an easy and rewarding job (5,5)

Daily Mail Cryptic #16947 | 11 Across | 2022-10-17 flower