Go round something sticky (3)
I believe the answer is:
goo
'something sticky' is the definition.
'go round' is the wordplay.
'round' becomes 'o' (o is a circular letter).
'go'+'o'='GOO'
(Other definitions for goo that I've seen before include "Sticky substance (sl.)" , "Substance that's viscous" , "syrup" , "Sticky wet material or sickly sentiment" , "Anything sticky" .)