Reportedly wasted entire reserve on hotel listings (8)

'hotel listings' is the definition.
Although both the answer and 'listings' are nouns, they are not in the same form of the noun.

'reportedly wasted entire reserve on' is the wordplay.
'reportedly' shows a homophone (sound like).
'wasted' becomes 'blew' (eg to blow money is to waste it).
'entire reserve' becomes 'book' (to book something is to reserve it. I am not sure about the 'entire' bit.).
'on' means one lot of letters go next to another.
'blew' sounds like 'blue'.
'blue'+'book'='BLUEBOOK'

Can you help me to learn more?