What does the cryptic crossword clue "Sub confused with advice to submerge with tank? (5-4)" mean?

The wordplay uses an anagram. anagram of SUB + ADVICE = SCUBA-DIVE The answer is SCUBA-DIVE.

Sub confused with advice to submerge with tank? (5-4)

Times Cryptic #28856 | 13 Down | 2024-03-05 flower