Rambo and Joe Exotic showing a lot of bottle (8)
I believe the answer is:
jeroboam
'a lot of bottle' is the definition.
I know that 'bottle' relates to this answer.
'rambo and joe exotic' is the wordplay.
'and' is a charade indicator (letters next to each other).
'exotic' indicates anagramming the letters (an unusual form of the letters).
'rambo'+'joe'='rambojoe'
'rambojoe' with letters rearranged gives 'JEROBOAM'.
'showing' acts as a link.
Can you help me to learn more?
(Other definitions for jeroboam that I've seen before include "Very large wine bottle named after Israeli king" , "'Large wine bottle, equal to four standard ones (8)'" , "Ancient king" , "Four-times bottle size" , "Wine bottle 4-12 times the ordinary size" .)