Tops of nerve plexus in damaged cheeks and that annoys terribly (8)

'that annoys terribly' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'tops of nerve plexus in damaged cheeks' is the wordplay.
'tops of' suggests taking the first letters.
'in' means one lot of letters goes inside another.
'damaged' is an anagram indicator.
The first letters of 'nerve plexus' is 'np'.
'cheeks' anagrammed gives 'heecks'.
'np' going into 'heecks' is 'HENPECKS'.

'and' acts as a link.

Can you help me to learn more?