Cryptic crossword clue
First of terms in Chambers cut, however I have to be adding something grammatically 11

The most common and most likely answer to this crossword clue is the 11 letter word ATTRIBUTIVE

I've seen this crossword clue in Independent
A
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Buddy explains!

The straight part
We know that "adding something grammatically" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case adding something grammatically = attributive.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

Crossword Answer definitions

ATTRIBUTIVE noun
  1. (grammar) An attributive word or phrase (see above), contrasted with predicative or substantive.
ATTRIBUTIVE adjective
  1. (grammar, of a word or phrase) Modifying a noun, while in the same phrase as that noun.
  2. Having the nature of an attribute.
  3. Serving to express an attribute of an object.

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