is 'somewhat' an adverb of degree?

what is post-finite position?

'Somewhat' is an adverb which means 'to a certain extent'.

It would have been better if you had specified the context from where you are asking 'post finite position'. In terms of grammar, it should refer to a position behind the finite verb in a sentence.

In case, your question is asking something else, you can post your query again by clearly elaborating your question. We will be happy to help you.