Tour is ruined by man wanting a hand (6)
I believe the answer is:
suitor
'man wanting a hand' is the definition.
I can't judge whether this defines the answer.
'tour is ruined' is the wordplay.
'ruined' is an anagram indicator.
'tour'+'is'='touris'
'touris' is an anagram of 'SUITOR'.
'by' acts as a link.
Can you help me to learn more?
(Other definitions for suitor that I've seen before include "Wooer" , ". . . he woos his girl" , "Man pursuing a woman for marriage" , "One seeking marriage" , "He pays court to a woman" .)