Jerk going on vacation to stop flim-flam (6)
I believe the answer is:
wiggle
'jerk' is the definition.
(thesaurus)
'going on vacation to stop flim-flam' is the wordplay.
'on vacation' suggests removing the centre (after the inside letters have vacated the word).
'to stop' is an insertion indicator (stop can mean to plug a hole in something).
'flim-flam' becomes 'wile' (I can't justify this - if you can you should believe this answer much more).
'going' with its middle taken out is 'gg'.
'gg' going inside 'wile' is 'WIGGLE'.
Can you help me to learn more?
(Other definitions for wiggle that I've seen before include "Move jerkily" , "Worm-like movement (of the hips?)" , "Leg wig (anag.)" , "Jiggle, joggle" , "Move from side to side, say toes" .)