What a + NOUN PHRASE
Exclamative ‘what’ can precede the indefinite article and is, therefore, a predeterminer. Here’s an example: What a surprise! Listen In the English Grammar Profile, A2 point 38 in the category of CLAUSES/exclamations: ‘What a’ + noun phrase and ‘What a’ + noun phrase + clause However, in the English Vocabulary Profile, ‘what’ is listed at B1 …