What does the cryptic crossword clue "Opposing abolishing small lunchtime breaks (5)" mean?

The definition is "breaks". The wordplay uses a charade (building blocks). RESTS (deletion) = RESTS; definition: "breaks" The answer is RESTS.

Opposing abolishing small lunchtime breaks (5)

Guardian Cryptic #28989 | 23 Down | 2023-02-09 flower