More moist than unleavened bread (6)
I believe the answer is:
damper
'more moist' is the definition.
('damp' can be a synonym of 'moist')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for damper that I've seen before include "bush bread" , "more soppy" , "Silencing pad for piano string" , "Vibration reducer" , "Negative influence - more moist" .)