Crossword Genius

Dismayed what happens when first three characters fail to get job? (12)

Ross

I believe the answer is:

disappointed

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'dismayed what happens when first three characters' is the definition.
I can't tell whether this defines the answer.

'fail to get job?' is the wordplay.
'fail' becomes 'disappoint' (I've seen this before).
'to get job?' becomes 'ed' (I can't explain this - if you can you should believe this answer much more).
'disappoint'+'ed'='DISAPPOINTED'

Can you help me to learn more?

(Other definitions for disappointed that I've seen before include "Saddened" , "Sad and let-down" , "Feeling sad" , "Unhappy" , "Let down" .)

I've seen this clue in The Times.
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