ONETRACK

Obsessed with a single subject (3-5)

Solution has appeared in 2 crosswords (2 across and 0 down):

• Quick crossword No 15,793 — 2020-12-18 00:00:13
  10A: With just a single idea (3-5)
• Quick crossword No 15,253 — 2019-03-28 00:00:17
  10A: Obsessed with a single subject (3-5)