There's big heart in her backhand (5)

I believe the answer is:

dinah

I'm a little stuck... Click here to teach me more about this clue!

'there's big' is the definition.
I can't judge whether this defines the answer.

'heart in her backhand' is the wordplay.
'heart in' indicates the central letters.
'her' becomes 'Edin'.
'backhand' becomes 'nah' (I can't justify this - if you can you should give a lot more credence to this answer).
The centre of 'edin' is 'di'.
'di'+'nah'='DINAH'

Can you help me to learn more?

(Other definitions for dinah that I've seen before include "_____ 15+22, singer" , "Washington perhaps" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.