This would have made it clear that the Word was 'a certain god', but not the one he was just referring to. He actually has a 'Part II' which discusses some special issues with the article. The subject of this clause is 'the Word' and the predicate is 'God'. In Greek, the word 'God' comes before the word 'Word'. Oftentimes, emphasis is shown in Greek by placing a word out of its normal, expected word order.
Special emphasis is shown when the predicate comes first in the sentence.
However, since it does not have the definite article, it does indicate that this Word was not the same 'person' as the Father God, but has the same 'essence' and 'nature'. The Context of All of the Apostle John's Writings It is also necessary to see this statement in context of the rest of John's writings. When comparing this with other statements about who the person and nature of Jesus Christ really is, it adds to what is already made clear by the Greek grammar. These verses also indicate that, in John's understanding and thus the Bible's clear statements, Jesus Christ is the same essence and nature as God the Father, but distinct in their person-hood. Consulting with Other Well Respected Greek Scholars and Grammarians For a further explanation and clarification about these items, it is helpful to consult with many of the well respected Greek scholars and expositors.