A small insect in lime from Belgium (3)
I believe the answer is:
bug
'a small insect' is the definition.
'bug' can be an answer for 'insect' (bug is a kind of insect). I'm unsure of the 'a small' bit.
'lime from belgium' is the wordplay.
I cannot really see how this works, but
'belgium' could be 'b' (international vehicle registration code) and 'b' is found in the answer.
The remaining letters 'ug' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for bug that I've seen before include "Insect, or flaw in computer program" , "Computer glitch" , "Computer program error" , "Disease-germ" , "It's snug in a rug (3)" .)