What does the cryptic crossword clue "Measure of frequency of period pains reported (5)" mean?

The definition is "Measure of frequency of period". The wordplay uses a homophone (sounds like). sounds like (reported) “hurts”. The answer is HERTZ.

Measure of frequency of period pains reported (5)

Times Cryptic #29255 | 21 Down | 2025-06-13 flower