TECHNICAL

Requiring specialist knowledge to be understood (9)

Solution has appeared in 2 crosswords (1 across and 1 down):

• Quick crossword No 16,623 — 2023-08-15 23:00:31
  15A: According to a strict interpretation of the rules — I catch Len (anag) (9)
• Quick crossword No 16,094 — 2021-12-06 00:00:08
  6D: Requiring specialist knowledge to be understood (9)