Ancient blubber and unusual bone enthralling one (5)
I believe the answer is:
niobe
'ancient blubber' is the definition.
(figure of Greek myth famous for crying or blubbing)
'unusual bone enthralling one' is the wordplay.
'unusual' indicates anagramming the letters.
'enthralling' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'bone' is an anagram of 'nobe'.
'nobe' placed around 'i' is 'NIOBE'.
'and' acts as a link.
(Other definitions for niobe that I've seen before include "woman of sorrows" , "Sad female" , "Tantalus's daughter" , "Daughter of Tantalus whose children were all slain" , "Greek woman cast in stone" .)