Islamic buildings infiltrated by International Tax Office bugs (10)
I believe the answer is:
mosquitoes
'bugs' is the definition.
The answer and definition can be both animals as well as being plural nouns.
Perhaps you can see a link between them that I can't see?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for mosquitoes that I've seen before include "Bearers of malaria" , "Irritating fliers" , "Flies" , "Carriers of disease" , "Malaria carriers" .)