Sensible English celebrity divides half of wealth (9)
I believe the answer is:
realistic
'sensible' is the definition.
(I've seen this before)
'english celebrity divides half of wealth' is the wordplay.
'english' becomes 'E' (abbreviation).
'celebrity' becomes 'alist' (I've seen this before).
'divides' indicates putting letters inside (inserted letters divide the word).
'half of' suggests halving the letters.
'wealth' becomes 'riches' (synonyms).
'e'+'alist'='ealist'
'riches' halved is 'ric'.
'ealist' going within 'ric' is 'REALISTIC'.
(Other definitions for realistic that I've seen before include "believable" , "Level-headed" , "Practical; true to life" , "Objective" , "Lifelike" .)