Islander thanks Welsh girl entertaining crew (9)
I believe the answer is:
tasmanian
'islander' is the definition.
(I've seen this before)
'thanks welsh girl entertaining crew' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'welsh girl' becomes 'sian' (common Welsh name).
'entertaining' indicates putting letters inside.
'crew' becomes 'man' (both can mean to operate or staff).
'sian' placed around 'man' is 'smanian'.
'ta'+'smanian'='TASMANIAN'
(Other definitions for tasmanian that I've seen before include "Ferocious Australian marsupial" , "from state in Commonwealth" , "of island" , "Islander" , "From one Australian state" .)