Unimpressed, left in Black Sea resort (5)
I believe the answer is:
blase
'unimpressed' is the definition.
(I've seen this in another clue)
'left in black sea resort' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' indicates putting letters inside.
'black' becomes 'b' (abbreviation as in pencil hardness).
'resort' is an anagram indicator (re-sort the letters).
'sea' with letters rearranged gives 'ase'.
'b'+'ase'='base'
'l' placed inside 'base' is 'BLASE'.
(Other definitions for blase that I've seen before include "Having a "seen it all before" attitude" , "Jaded" , "Showing indifference through overfamiliarity" , "Bored with sable" , "Nonchalant, unconcerned" .)