What does the cryptic crossword clue "Loiter with a mugshot reproduced for medical expert (14)" mean?

The wordplay uses an anagram. anagram of LOITER + A + MUGSHOT = RHEUMATOLOGIST The answer is RHEUMATOLOGIST.

Loiter with a mugshot reproduced for medical expert (14)

Daily Mail Cryptic #17018 | 8 Down | 2023-01-24 flower