Instant suspicion follows loveless pair (9)
I believe the answer is:
twinkling
'instant' is the definition.
(I know that instant can be written as twinkling)
'suspicion follows loveless pair' is the wordplay.
'suspicion' becomes 'inkling' (I've seen this before).
'follows' means one lot of letters go next to another.
'loveless pair' becomes 'tw' (I can't explain this - if you can you should believe this answer much more).
'inkling' after 'tw' is 'TWINKLING'.
Can you help me to learn more?
(Other definitions for twinkling that I've seen before include "Instant" , "Jiffy" , "Sparkling like a star" , "Sparkling - moment" , "Shining intermittently" .)