Like something one might get from a letter? (8)

'like' is the definition.
Both the answer and definition are adjectives.
Perhaps they are linked in a way I don't understand?

'something one might get from a letter?' is the wordplay.
I cannot really see how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is found within the answer.
'from' could be 'e' (I've seen this in other clues) and 'e' is present in the answer.
'a' is found in the answer.
'letter?' could be 's' and 's' is present in the answer.
This may be the basis of the clue (or it may be nonsense).