Let's go crazy at start of tour, and wander off (3,4)
I believe the answer is:
get lost
'wander off' is the definition.
I can't judge whether this defines the answer.
'let's go crazy at start of tour' is the wordplay.
'crazy' is an anagram indicator.
'at start of' says to take the initial letters.
The initial letter of 'tour' is 't'.
'lets'+'go'='letsgo'
'letsgo' anagrammed gives 'getlos'.
'getlos'+'t'='GET LOST!'
'and' is the link.
Can you help me to learn more?
(Other definitions for get lost that I've seen before include "stay away" , "Begone" , "Stop pestering me!" , "beat it" , "without the map?" .)