A Welsh girl — from Pakistan, perhaps (5)
I believe the answer is:
'pakistan perhaps' is the definition.
I can't judge whether this definition defines the answer.
'a welsh girl' is the wordplay.
'welsh girl' becomes 'Sian' (common Welsh name).
'from' acts as a link.
Can you help me to learn more?
(Other definitions for asian that I've seen before include "eg Pakistani" , "Of the largest continent" , "From large continent" , "One from big continent" , "Type of flu" .)