جَلِيًّا بِنَفْسِهِ
Clear without an additional convention.
When the common quality is immediately recognizable, the audience need not solve a puzzle to understand the transferred image. For example, describing a brave person as a lion normally relies on a readily available association with courage.
Clarity is an important condition, but a familiar resemblance is not automatically a brilliant one. The figure should still achieve the particular purpose with force, economy, or vividness rather than merely restate an ordinary comparison.