To open sunshade the very thing for tourist (7)
I believe the answer is:
visitor
'tourist' is the definition.
(thesaurus)
'to open sunshade the very thing' is the wordplay.
I cannot really see how this works, but
'to' is found in the answer.
'very' could be 'v' (abbreviation) and 'v' is found within the answer.
This may be the basis of clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for visitor that I've seen before include "One coming calling" , "Person turning up" , "Seasonal migratory bird" , "Guest - tourist" , "Caller, guest" .)