Some accessible character (3)
I believe the answer is:
ess
'character' is the definition.
(the letter S)
'some accessible' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ESS' is hidden in the letters of 'accessible'.
(Other definitions for ess that I've seen before include "top secret" , "Letter from Mid-West" , "One next to tee" , "Alphabet letter" , "Nineteenth letter" .)