Without exception, skill is seen in a certain hospital (2,5)
I believe the answer is:
on earth
'without exception' is the definition.
(ie every example of something on Earth)
'skill is seen in a certain hospital' is the wordplay.
'skill' becomes 'art' (both can mean a talent).
'is seen in' is an insertion indicator.
'a certain' becomes 'one' (ie one particular example of something).
'hospital' becomes 'h' (abbreviation for hospital on maps).
'one'+'h'='oneh'
'art' placed inside 'oneh' is 'ON EARTH'.
(Another definition for on earth that I've seen is " where you are".)