Being angry, list out content of transport (9)
I believe the answer is:
bristling
'being angry list out content of transport' is the definition.
I can't tell whether this defines the answer.
'list out content of transport' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'content' is an insertion indicator.
'of transport' becomes 'bring' (I can't explain this - if you can you should believe this answer much more).
'list' is an anagram of 'istl'.
'istl' inserted within 'bring' is 'BRISTLING'.
Can you help me to learn more?
(Other definitions for bristling that I've seen before include "Seeing red" , "Reacting defensively" , "Very cross" , "visibly indignant?" .)