What does the cryptic crossword clue "Police chief’s left suffering with bug (1,4)" mean?

The definition is "bug". The wordplay uses an anagram. anagram of OLICE = ECOLI; definition: "bug" The answer is ECOLI.

Police chief’s left suffering with bug (1,4)

Guardian Cryptic #29485 | 21 Down | 2024-09-11 flower