Confused Asian tackles question for old theologian (7)
I believe the answer is:
aquinas
'for old theologian' is the definition.
(I've seen this before)
'confused asian tackles question' is the wordplay.
'confused' indicates anagramming the letters.
'tackles' means one lot of letters goes inside another (some letters tackle or block in others).
'question' becomes 'qu' (abbreviation).
'asian' with letters rearranged gives 'ainas'.
'ainas' enclosing 'qu' is 'AQUINAS'.
(Other definitions for aquinas that I've seen before include "Old theologian" , "Sainted theologian" , "Saintly theologian" , "'dumb ox'" , "Saint Thomas --, Italian theologian" .)