Related Clues:

• Implied but unsaid
• Aircraft engine casing
• Understood mischief-maker's staying within the law
• Nun's Aida part is left to the imagination
• Assumed, not spelled out
• Latent, unexpressed
• Mischievous child allowed to be present, but not visible
• Implied one should be into diplomacy
• Implied, unstated
• Silent, returning in arctic atmosphere
• World organisation's help withdrawn
• Unrecorded now the historian leaves us out
• I engaged in diplomacy without speaking
• Understood it after Tom retired
• Understood that any crossword is tricky, initially