I have support for on-line test that is controversial (7)
I believe the answer is:
emotive
'is controversial' is the definition.
(I've seen this before)
'i have support for on-line test' is the wordplay.
'i have' becomes 'ive'.
'support for' means one lot of letters go next to another.
'on-line' becomes 'e' (abbreviation for electronic, e.g. in ecommerce).
'test' becomes 'mot'.
'e'+'mot'='emot'
'ive' after 'emot' is 'EMOTIVE'.
'that' is the link.
(Other definitions for emotive that I've seen before include "Highly-charged" , "Arousing intense feelings" , "Stirring feeling" , "Stirring feelings" , "Causing strong feelings" .)