What reveals and, in a manner of speaking, inspires? (10)
I believe the answer is:
indication
'what reveals' is the definition.
(an indication reveals or indicates something)
'in a manner of speaking inspires?' is the wordplay.
'manner of speaking' becomes 'diction' (a person's way of speaking).
'inspires?' means one lot of letters goes inside another (inspire means to breathe in).
'a' put within 'diction' is 'dication'.
'in'+'dication'='INDICATION'
'and' acts as a link.
(Other definitions for indication that I've seen before include "Sign (of something)" , "it shows" , "form of evidence" .)