clear/clearly

[allthewayanime]

I would like to know why in the following sentence clearly is used instead of clear, does it function as an intensifier adverb?

e.g. It's clearly a clip from the Vacation drama.

 

[bhaisahab]

I would like to know why in the following sentence clearly is used instead of clear, does it function as an intensifier adverb?

e.g. It's clearly a clip from the Vacation drama.

It's used because "It's clear a clip from the Vacation drama" would be incorrect.

 

[allthewayanime]

Why would 'clear' be incorrect?

 

[5jj]

Why would 'clear' be incorrect?

Because an adverb is required here.