The Qur’an is expressed in clear Arabic, yet not every reader in every period immediately understands every word, construction, or historical reference. Obscurity may arise from unusual vocabulary, ellipsis, pronoun reference, rhetoric, general versus particular meaning, or context. Explaining a rare expression resolves that expression; it does not automatically explain every purpose of the verse.
Sometimes the noun is familiar but the preposition changes its construction, so translating only the noun is insufficient. At other times each word is ordinary, yet the pronoun’s antecedent is uncertain; grammar matters more than a dictionary.
Diagnosis must precede remedy: identify the type of difficulty, then use the corresponding linguistic, grammatical, historical, or rhetorical evidence.