"___ you!" (5)
'you' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for thee that I've seen before include "you many years ago" , "Quaker 'you'" , "Old objective second person singular" , "'U'" , "You (arch.)" .)
(Other definitions for what that I've seen before include "Eh?" , "Interrogatory word" , "That which - come again!" , "Which thing?" , "Word used in a question" .)
(Other definitions for betcha that I've seen before include "I'll put money on it" , "I'm certain" .)
(Other definitions for bless that I've seen before include "Approve of" , "Invoke divine favour on" , "set aside for holy purpose?" , "Sanctify" , "Pray for" .)