During the Second World War the company made special shaving brushes with secretcompartments for a map and compass, so escaping PoWs could find their way home.
Times, Sunday Times (2009)
There may well be other, secretcompartments but, if so, they were so secret that I failed to find them.
Times, Sunday Times (2012)
When she said yes, he took a ring out of a secretcompartment.
Times, Sunday Times (2009)
Definition of 'compartment'
compartment
(kəmpɑːʳtmənt)Explore 'compartment' in the dictionary
countable noun
A compartment is one of the separate parts of an object that is used for keeping things in.