Enormous omissions in short final letter (8)
I believe the answer is:
outsized
'enormous' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?
'omissions in short final letter' is the wordplay.
'omissions' becomes 'outs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'short' indicates taking the first letters.
'final letter' becomes 'zed'.
The initial letter of 'in' is 'i'.
'outs'+'i'+'zed'='OUTSIZED'
Can you help me to learn more?
(Another definition for outsized that I've seen is " Larger than normal".)