…to fuel forum threads (5)
I believe the answer is:
togas
'forum threads' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
'to fuel' is the wordplay.
'fuel' becomes 'gas' (gas is a fuel).
'to'+'gas'='TOGAS'
Can you help me to learn more?
(Other definitions for togas that I've seen before include "Roman garments" , "clothing" , "garments worn by ancient Romans" , "What some ancient citizens wore" .)