To back her is a help (5)
I believe the answer is:
diana
'help' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'to back her is a' is the wordplay.
'to back' is a charade indicator (letters next to each other) (some letters go at the back of others).
'her' becomes 'dian' ().
'dian'+'a' is 'DIANA'.
Can you help me to learn more?
(Other definitions for diana that I've seen before include "Woman" , "British princess" , "Roman goddess of the hunt, or tragic English princess" , "Roman goodess of hunting or tragic English princess" , "MONKEY" .)