What does the cryptic crossword clue "Inspector again involved in painful affair of the heart (6,8)" mean?

The wordplay uses an anagram. anagram of INSPECTOR + AGAIN = ANGINAPECTORIS The answer is ANGINAPECTORIS.

Inspector again involved in painful affair of the heart (6,8)

Guardian Cryptic #22121 | 1 Across | 2001-02-01 flower