How many letters does the top answer for “a careful examiner; someone who inspects with great care” have?

The most common answer is scrutiniser (11 letters).

Crossword clue: a careful examiner; someone who inspects with great care

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

scrutiniser 11 letters wn-def

a careful examiner; someone who inspects with great care

scrutinizer 11 letters wn-def

a careful examiner; someone who inspects with great care