Plantigrade mammal southern ambassador put up with (3-4)
I believe the answer is:
she-bear
'plantigrade mammal' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'southern ambassador put up with' is the wordplay.
'southern' becomes 's' (abbreviation).
'ambassador' becomes 'HE' (His or Her Excellency).
'put up with' becomes 'bear' (synonyms).
's'+'he'+'bear'='SHE-BEAR'
Can you help me to learn more?
(Another definition for she-bear that I've seen is " This female more deadly than the male (Kipling)".)