Mean devil entering lift (6)
I believe the answer is:
skimpy
'mean' is the definition.
(I've seen this before)
'devil entering lift' is the wordplay.
'devil' becomes 'imp' (devilish creature).
'entering' means one lot of letters goes inside another.
'lift' becomes 'sky' (I can't explain this - if you can you should give a lot more credence to this answer).
'imp' inserted within 'sky' is 'SKIMPY'.
Can you help me to learn more?
(Other definitions for skimpy that I've seen before include "'Scanty, barely enough (6)'" , "Containing little excess" , "Meagre; (of clothes) short and revealing" , "Having hardly enough" , "Made with barely sufficient material (of clothes)" .)