What does the cryptic crossword clue "Variable resistance that rose with regulation (8)" mean?

The definition is "Variable resistance". The wordplay uses an anagram. anagram of THAT + ROSE = RHEOSTAT; definition: "Variable resistance" The answer is RHEOSTAT.

Variable resistance that rose with regulation (8)

Guardian Cryptic #24781 | 6 Down | 2009-08-18 flower

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