Head of the delegation in rearranged tour of the royal house (5)
I believe the answer is:
tudor
'the royal house' is the definition.
(Tudor is an example)
'head of the delegation in rearranged tour' is the wordplay.
'head of' says to take the initial letters.
'in' means one lot of letters goes inside another.
'rearranged' indicates an anagram.
The first letter of 'delegation' is 'd'.
'tour' anagrammed gives 'tuor'.
'd' placed within 'tuor' is 'TUDOR'.
'of' acts as a link.
(Other definitions for tudor that I've seen before include "Rose" , "Architectural style" , "regal dynasty" , "Member of the dynasty ruling England 1485-1603" , "Welsh royal family" .)