How many letters does the top answer for “relentless and indefatigable in pursuit or as if in pursuit” have?

The most common answer is dogging (7 letters).

Crossword clue: relentless and indefatigable in pursuit or as if in pursuit

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

dogging 7 letters wn-def

relentless and indefatigable in pursuit or as if in pursuit

persisting 10 letters wn-def

relentless and indefatigable in pursuit or as if in pursuit