What does the cryptic crossword clue "Using a digger as weapon to secure poor-quality residence (10)" mean?

The wordplay uses a container (one word inside another). HOVEL (synonym="HOVEL") in SLING (synonym="SLING") = SHOVELLING The answer is SHOVELLING.

Using a digger as weapon to secure poor-quality residence (10)

Guardian Cryptic #29233 | 3 Down | 2023-11-21 flower