What does the cryptic crossword clue "Don't use the tawse indiscriminately (5)" mean?

The definition is "Don't". The wordplay uses an anagram. anagram of TAWSE = WASTE; definition: "Don't" The answer is WASTE.

Don't use the tawse indiscriminately (5)

Guardian Cryptic #22030 | 23 Down | 2000-10-16 flower