Cave in wooded area everyone's back inside (8)
I believe the answer is:
collapse
'cave' is the definition.
(I've seen this in another clue)
'wooded area everyone's back inside' is the wordplay.
'wooded area' becomes 'copse' (I've seen this in another clue).
'everyone' becomes 'all' (all people).
'back' says the letters should be written backwards.
'inside' indicates putting letters inside.
'all' in reverse letter order is 'lla'.
'copse' enclosing 'lla' is 'COLLAPSE'.
'in' acts as a link.
(Other definitions for collapse that I've seen before include "Sudden fall" , "Fall down suddenly like escallop" , "Give way or cave in" , "Slump" , "Fall down or cave in" .)