Intact inscription leader understood (5)
I believe the answer is:
tacit
'understood' is the definition.
(I know that understood can be written as tacit)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for tacit that I've seen before include "Silent - understood" , "Understood without being directly expressed" , "Understood, not spoken or played" , "Not said though understood" , "Unspoken but understood" .)