Gentle hint largely designed to impart information (9)
I believe the answer is:
enlighten
'impart information' is the definition.
(share information with someone)
'gentle hint largely designed' is the wordplay.
'largely' means to remove the last letter (most but not all of the letters).
'designed' indicates an anagram (designed with the letters).
'gentle'+'hint'='gentlehint'
'gentlehint' with its last letter taken away is 'gentlehin'.
'gentlehin' is an anagram of 'ENLIGHTEN'.
'to' acts as a link.
(Other definitions for enlighten that I've seen before include "Illuminate" , "Edify" , "Impart knowledge to" , "Explain" , "Free from ignorance" .)