How many letters does the top answer for “the relation of something to the matter at hand” have?

The most common answer is relevance (9 letters).

Crossword clue: the relation of something to the matter at hand

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

relevance 9 letters wn-def

the relation of something to the matter at hand

relevancy 9 letters wn-def

the relation of something to the matter at hand

the lack of a relation of something to the matter at hand 80% similar → irrelevance, irrelevancy