Silly person beginning to divulge answer (7)
I believe the answer is:
respond
'answer' is the definition.
(I know that answer can be written as respond)
'silly person beginning to divulge' is the wordplay.
'silly' indicates anagramming the letters.
'beginning to' suggests taking the first letters.
The first letter of 'divulge' is 'd'.
'person' is an anagram of 'respon'.
'respon'+'d'='RESPOND'
(Other definitions for respond that I've seen before include "Write back" , "Come back" , "React (positively) to a stimulus or treatment" , "Answer back" , "Answer or react" .)