The definition here is not put into words! (11,4)
I believe the answer is:
exclamation mark
'the definition here is not' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'into words' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'into' is 'tion' which is present in the answer.
This explanation may well be incorrect...
'put' is the link.
Can you help me to learn more?
(Another definition for exclamation mark that I've seen is " With surprising completion of sentence".)