Related Clues:

• Necessary to completeness of whole
• Necessary as part of a whole, like triangle
• Triangle being essential
• Of part necessary to the completeness of a whole
• A component and indispensable part of, like triangle
• Altering so as to be necessary to the whole
• Relating to being complete
• 'Inherent, inbuilt (8)'
• In nil it's a great part necessary
• The gent in the rail is an essential part of it
• Inbuilt, essential
• It's essential to get a little interest and a large return
• It's essential to break tin with broad back
• Entire sprinters' centre led great comeback
• Possibly relating to the whole