Renown in association with yours truly (4)
I believe the answer is:
fame
'renown' is the definition.
(synonyms)
'in association with yours truly' is the wordplay.
'in association' becomes 'fa' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'with' means one lot of letters go next to another.
'yours truly' becomes 'me'.
'fa'+'me'='FAME'
Can you help me to learn more?
(Other definitions for fame that I've seen before include "''... is the spur that the clear spirit doth raise (Lycidas, John Milton)" , "Repute" , "Favourable public reputation" , "Musical - stardom" , "Prominence" .)