Busy Asian river — tours I suspect (11)
I believe the answer is:
industrious
'busy' is the definition.
(thesaurus)
'asian river tours i suspect' is the wordplay.
'asian river' becomes 'indus' (I've seen this before).
'suspect' indicates an anagram.
'tours'+'i'='toursi'
'toursi' anagrammed gives 'trious'.
'indus'+'trious'='INDUSTRIOUS'
(Other definitions for industrious that I've seen before include "Busy" , "Diligent, hard-working" , "Hard working" , "Toiling hard" .)