Having taken a look at, left (7,3)

I believe the answer is:
checked out
'having taken a look at left' is the definition.
I can't tell whether this defines the answer.
'taken a look at left' is the wordplay.
'taken a look at' becomes 'checked' (checking is a kind of taking a look at).
'left' becomes 'out' (I can't explain this - if you can you should believe this answer much more).
'checked'+'out'='CHECKED OUT'
Can you help me to learn more?
(Another definition for checked out that I've seen is " investigated".)
