The suffix ‑nya is one of the most frequent and polysemic suffixes in Indonesian. It can provide definite determination and topicalization. The “Verb‑nya“, which often appears in a topicalized subject Noun Phrase (NP), is generally labelled as a deverbal noun. Nevertheless, many syntactic constraints set it apart from Indonesian deverbal nouns. “Verb‑nya“ must be complemented by a NP, which can easily be reconstructed as a former subject: a sentence is topicalized and thus becomes a noun clause, generally the subject of the main clause Verb Phrase (VP). I argue that “Verb‑nya“ is a subordinate noun clause, almost always conveying causality. This causal noun clause, an innovation in formal written Indonesian (especially in the media), seems to fill a “gap“: the impossibility of beginning a sentence with a subordinating morpheme (‘that’, ‘because’).