DELVE

Make painstaking enquiries (into something) (5)

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

• Quick crossword No 15,678 — 2020-08-05 23:00:14
  22A: Search for information (5)
• Quick crossword No 15,269 — 2019-04-15 23:00:34
  11A: Make painstaking enquiries (into something) (5)