Okay welcome in the heart of Laos (5,2)

'okay' is the definition.
(both can mean to approve something)

'welcome in the heart of laos' is the wordplay.
I cannot really see how this works, but
'welcome' could be 'greet' (I've seen this before) and 'greet' is present in the answer.
'of' could be 'o' and 'o' is present in the answer.
A single letter 'a' remains which might be clued in a way I don't see.
This explanation may well be incorrect...