Primate Bob sloshed, into mother's ruin (6)
I believe the answer is:
gibbon
'primate' is the definition.
(I know that gibbon is a type of lesser ape)
'bob sloshed into mother's ruin' is the wordplay.
'sloshed' is an anagram indicator.
'into' means one lot of letters goes inside another.
'mother's ruin' becomes 'gin' (informal term for gin).
'bob' with letters rearranged gives 'bbo'.
'bbo' placed into 'gin' is 'GIBBON'.
(Other definitions for gibbon that I've seen before include "Small arboreal ape" , "author of Decline and Fall, etc" , "Small tree-dwelling ape with long powerful arms" , "Large tailless ape" , "MONKEY" .)