DOB, sex and name finally needed to work in part of plant (7)

'part of plant' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'dob sex and name finally needed to work' is the wordplay.
'and' means one lot of letters go next to another.
'finally' suggests the final letters.
'needed' means one lot of letters go next to another.
'to work' is an anagram indicator (letters worked into a new order).
The final letter of 'name' is 'e'.
'sex' put after 'e' is 'esex'.
'dob'+'esex'='dobesex'
'dobesex' with letters rearranged gives 'SEEDBOX'.

'in' acts as a link.

Can you help me to learn more?