18a. Old English word originally denoting an inscription or descriptive placard giving information about an object, later the distinctive name of a book or other composition (5)
26a. Unit of time defined as ‘the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom’
(6)
32d. Item made/mended by a clicker, cobbler, cordwainer or snob. (4)