Small miner strips vertical end of quarry (6)
I believe the answer is:
sleepy
'small miner' is the definition.
(dwarf in Disney's Snow White and the Seven Dwarves)
'strips vertical end of quarry' is the wordplay.
'strips' becomes 'peels' (peeling is a kind of stripping).
'vertical' says the letters should be written backwards.
'end of' suggests the final letters.
The last letter of 'quarry' is 'y'.
'peels' written backwards gives 'sleep'.
'sleep'+'y'='SLEEPY'
(Other definitions for sleepy that I've seen before include "Feeling like having a snooze" , "Dwarf" , "Drowsy; indolent" , "Somnolent" , "Quiet" .)