Clue: Smoker in male with a long neck, old, old solver (7)
Answer: COLUMBO
Explanation: Definition: old solver
Acharade of COLUMB, an envelope ('in') of LUM (chimney, 'smoker') in COB (male swan. 'male with a long neck'); plus O ('old'), for the detective, played by Peter Falk, in the long-running American TV series.