So you go round again for (9)
I believe the answer is:
therefore
'so' is the definition.
(I've seen this before)
'you go round again for' is the wordplay.
'you' becomes 'thee' (I've seen this in other clues).
'go round' means one lot of letters goes inside another.
'again' becomes 're'.
're'+'for'='refor'
'thee' placed around 'refor' is 'THEREFORE'.
(Other definitions for therefore that I've seen before include "as result" , "Thus" , "has a triangular formation in maths?" , "It follows" , "Consequently - for that reason" .)