Bumpkin getting outside old lift abruptly (5)
I believe the answer is:
hoick
'lift abruptly' is the definition.
(I've seen this before)
'bumpkin getting outside old' is the wordplay.
'bumpkin' becomes 'hick' (synonyms).
'getting outside' means one lot of letters goes inside another.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'hick' enclosing 'o' is 'HOICK'.
(Other definitions for hoick that I've seen before include "Raise suddenly" , "Lift abruptly" , "Tug" , "jerk" , "Lift sharply" .)