Absurd American after developing crude oil without energy (9)
I believe the answer is:
Here is my best explanation:
'absurd' is the definition.
('ludicrous' can be a synonym of 'absurd')
'american after developing crude oil without energy' is the subsidiary indication.
'american' becomes 'us' (**).
'after' is a charade indicator (letters next to each other).
'developing' is an anagram indicator.
'without' indicates named letters should be taken away.
'energy' becomes 'e' (symbol in physics e.g. in Einstein's famous e=mcs).
'crudeoil' with 'e' removed is 'crudoil'.
'crudoil' anagrammed gives 'ludicro'.
'us' after 'ludicro' is 'ludicrous'.
(Other definitions for ludicrous that I've seen before include "Risible", "Farcical", "absurd", "Utterly laughable", "Ridiculously foolish", "Absurd, ridiculous", "Nonsensical", "Silly and laughable" and "Ridiculous".)