Decorative work bagging point, finally -- mark on score (8)
I believe the answer is:
crotchet
'on score' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'decorative work bagging point finally' is the wordplay.
'decorative work' becomes 'crochet' (crochet is a decorative craft).
'bagging' means one lot of letters goes inside another (bag can mean to take or obtain).
'finally' suggests the final letters.
The last letter of 'point' is 't'.
'crochet' enclosing 't' is 'CROTCHET'.
'mark' acts as a link.
Can you help me to learn more?
(Other definitions for crotchet that I've seen before include "Musical note equal to half a minim" , "Peacock's castle" , "Two quavers as one note" , "Quarter of a semibreve" , "Fancy" .)