Added recommendation for a jockey (5)
I believe the answer is:
rider
This clue could be a double definition.
'added recommendation' is the first definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?
'for a jockey' is the second definition.
(horse rider)
Can you help me to learn more?
(Other definitions for rider that I've seen before include "Equestrian or biker?" , "Possibly cavalier" , "Supplementary clause" , "Additional bit" , "Supplement to verdict" .)