Crossword Genius

Dismayed, a spook has a change of heart (6)

Ross

I believe the answer is:

aghast

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

'dismayed' is the definition.
(I know that dismayed can be written as aghast)

'a spook has a change of heart' is the wordplay.
'a spook has' becomes 'agha' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a change' becomes 'bustle' (bustle is a kind of change).
'of heart' indicates the central letters (I've seen 'heart' mean this).
The central letters of 'bustle' are 'st'.
'agha'+'st'='AGHAST'

Can you help me to learn more?

(Other definitions for aghast that I've seen before include "Horror-struck" , "Filled with horror or shock" , "Filled with consternation or horror" , "Thunderstruck" , "Taken aback with horror" .)

I've seen this clue in The Telegraph.
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