Past caring ultimately, or eagerly expectant? (4)
I believe the answer is:
agog
'eagerly expectant?' is the definition.
(I've seen this in another clue)
'past caring ultimately' is the wordplay.
'past' becomes 'ago' (similar in meaning).
'ultimately' says to take the final letters.
The final letter of 'caring' is 'g'.
'ago'+'g'='AGOG'
'or' acts as a link.
(Other definitions for agog that I've seen before include "Very eager (to hear/see)" , "Very curious to hear" , "Eager, avid" , "Bug-eyed" , "All ears" .)