Thrash and bash parvenu with no name

'thrash' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'bash parvenu with no name' is the wordplay.
'bash' indicates an anagram.
'with no' suggests deleting specific letters.
'name' becomes 'n' (common abbreviation e.g. on forms).
'parvenu' with 'n' taken away is 'parveu'.
'parveu' anagrammed gives 'RAVE-UP'.

'and' acts as a link.

Can you help me to learn more?