Crossword Genius

Vampires do this part with sweetheart (4)

Ross

I believe the answer is:

bite

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'vampires do this part with sweetheart' is the definition.
'bite' can be an answer for 'part' (thesaurus). I am unsure of the rest of the definition.

'part with sweetheart' is the wordplay.
'part' becomes 'bit' (both mean a piece of something).
'with' says to put letters next to each other.
'sweetheart' becomes 'e' (the heart/centre of 'sweet').
'bit'+'e'='BITE'

Can you help me to learn more?

(Other definitions for bite that I've seen before include "Nip; nibble" , "power" , "Mouthful" , "Cut with the teeth" , "Punch" .)

I've seen this clue in The Sun.
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