The contents of a bag of dismissal notices? (7)

I believe the answer is:

sackful

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'the contents of a bag' is the definition.
I can't judge whether this definition defines the answer.

'dismissal notices?' is the wordplay.
'dismissal' becomes 'sack' (synonyms).
'notices?' becomes 'ful' (I can't explain this - if you can you should believe this answer much more).
'sack'+'ful'='SACKFUL'

'of' is the link.

Can you help me to learn more?

(Other definitions for sackful that I've seen before include "Quantity held in large bag" , "Measured amount in large bag" , "Contents of large bag" .)

I've seen this clue in The Irish Independent.

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