Her neat appearance will give encouragement (7)

I believe the answer is:

hearten

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

'appearance will give encouragement' is the definition.
I can't tell whether this defines the answer.

'her neat' is the wordplay.
'her neat' can be anagrammed to 'HEARTEN'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for hearten that I've seen before include "giving cheer" , "Make (someone) more confident" , "Encourage in Teheran" , "Be encouraged" , "Inspirit" .)

I've seen this clue in the Evening Standard.

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