Slime having pleasing qualities? Not quite! (3)
I believe the answer is:
goo
'slime' is the definition.
(synonyms)
'pleasing qualities? not quite' is the wordplay.
I cannot quite see how this works, but
'not' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
The remaining letters 'go' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'having' acts as a link.
Can you help me to learn more?
(Other definitions for goo that I've seen before include "Sticky matter" , "mud, for example" , "Sticky and slimy stuff" , "Substance that's viscous" , "syrup" .)