Inscription showing commitment (10)
I believe the answer is:
dedication
I believe this clue is a double definition.
'inscription' is the first definition.
(dedication is a kind of inscription)
'commitment' is the second definition.
(synonyms)
'showing' acts as a link.
(Other definitions for dedication that I've seen before include "Devotion (to a task)" , "with which author often starts work" , "Commitment; inscription" , "tribute" .)