One-litre bar bottles produced (5)
I believe the answer is:
built
'produced' is the definition.
The definition and answer can be both to do with creating things as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?
'one-litre bar bottles' is the wordplay.
'one' becomes 'i' (Roman numeral).
'litre' becomes 'L' (abbreviation).
'bar' becomes 'but' (both can mean 'except for').
'bottles' is an insertion indicator (bottle can mean to contain).
'i'+'l'='il'
'il' inserted within 'but' is 'BUILT'.
Can you help me to learn more?
(Other definitions for built that I've seen before include "Constructed" , "Made by combining materials and parts" , "put together" , "Raised" , "Erected" .)