What does the cryptic crossword clue "Rayner’s moral responsibility with record investment? (6)" mean?

The wordplay uses a container (one word inside another). EP (synonym="EP") in DUTY (synonym="DUTY") = DEPUTY The answer is DEPUTY.

Rayner’s moral responsibility with record investment? (6)

Guardian Cryptic #29426 | 19 Down | 2024-07-04 flower