My prefix is a key member in rock history
My infix is a deadly sin missing its tail
My suffix is a prefix for the persistent
What am I?
1 Answer
The answer is:
SIRE - a term of address for a master or ruler (hence the use of 'royal' in the title).
My prefix is a key member in rock history
Si is the chemical symbol for Silicon, a key component of rocks and minerals that make up 90% of the Earth's crust.
My infix is a deadly sin missing its tail
IR is the deadly sin 'IRE' (also known as wrath or anger) without the final 'E'.
My suffix is a prefix for the persistent
RE is a common prefix for verbs implying something has been done again (and again and again...), like 'repeat', 'rerun', 'redo', etc. (And if somebody does something repeatedly they could be described as persistent in their task...)