Your question is grammatically and idiomatically incorrect in many ways. First of all "grammar", the way you are using it, cannot take the indefinate article "a". It is idiomatic to say "Is [quote sentence here] correct grammar?"
So it would appear that the phrase/ sentence you are asking about is "It does she clears your doubt." There are too many verbs and pronouns in this. Is the subject "it" or "she"? Is the verb "does" or "clears"? Either way, these are not verbs that can be used coherently with the object "doubt"--that is not a grammar problem but a usage problem. As a result it is impossible to get any meaning from this heap of words.
By learning correct grammar.
I highly doubt that we will have any snow days for the rest of the school year.
I doubt what I do not believe or trust while I am confused over what I do not understand.
almost same
More correct
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
No, it is correct grammar, not a correct grammar.
"On a train" is correct grammar.
no_____If the sentence is You do do that (meaning You are in the habit of doing that) the grammar is perfectly correct and the sentence 'does have correct grammar'.
No, the correct grammar would be: "July has just started."
Grammar.
This will be an exciting month is correct grammar.
The grammar is correct as it is.
No. The correct grammar is "would give"
Yes, that is correct grammar.
No, the correct grammar would be "I hate you the way you hate me."
The correct spelling is A - grammar.