Everyone included in check on outskirts of Tirana, the capital (8)
I believe the answer is:
Here is my best explanation:
'the capital' is the definition.
(Valletta is an example)
'everyone included in check on outskirts of tirana' is the subsidiary indication.
'everyone' becomes 'all' (I've seen this before).
'included in' is an insertion indicator.
'check' becomes 'vet' (I've seen this in other clues**).
'on' means one lot of letters go next to another.
'outskirts of' means to remove the middle letters.
'tirana' with its middle removed is 'ta'.
'all' inserted within 'vet' is 'vallet'.
(Other definitions for valletta that I've seen before include "The capital of Malta", "Hard biscuit", "Capital of Malta", "Malta's capital", "my neighbouring capital" and "Maltese capital".)