Bound dictionary includes 'book with a gilt refinement' (9)
I believe the answer is:
obligated
'bound' is the definition.
(similar in meaning)
'dictionary includes book with a gilt refinement' is the wordplay.
'dictionary' becomes 'OED' (Oxford English Dictionary).
'includes' is an insertion indicator.
'book' becomes 'b' (abbreviation for book).
'with' is a charade indicator (letters next to each other).
'refinement' is an anagram indicator (letters must be refined).
'b'+'a'+'gilt'='bagilt'
'bagilt' is an anagram of 'bligat'.
'oed' placed around 'bligat' is 'OBLIGATED'.
(Other definitions for obligated that I've seen before include "Bound" , "Morally compelled" , "in debt" .)