Didn't stand by younger man who's a bit of an animal (5)
I believe the answer is:
satyr
'man who's a bit of an animal' is the definition.
I can't tell whether this defines the answer.
'didn't stand by younger' is the wordplay.
'didn't stand' becomes 'sat' (sitting as opposed to standing).
'by' is a charade indicator (letters next to each other).
'younger' becomes 'yr' (abbreviation used in some aristocratic titles).
'sat'+'yr'='SATYR'
Can you help me to learn more?
(Other definitions for satyr that I've seen before include "nymphalid" , "Part man, part goat" , "Classical deity" , "Forest god; lustful man" , "Woodland god; butterfly" .)