How many letters does the top answer for “set or place in” have?

The most common answer is inset (5 letters).

Crossword clue: set or place in

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

inset 5 letters wn-def

a small picture inserted within the bounds or a larger one

place or set apart 67% similar → insulate, isolate

to place or set in a diadem, as a gem or gems. 50% similar → indiadem

to set pr place wrongly. 50% similar → misset