Dim Pole disorientated in collapse (7)
I believe the answer is:
implode
'collapse' is the definition.
(imploding is a kind of collapsing)
'dim pole disorientated' is the wordplay.
'disorientated' indicates anagramming the letters.
'dim'+'pole'='dimpole'
'dimpole' is an anagram of 'IMPLODE'.
'in' acts as a link.
(Other definitions for implode that I've seen before include "Burst inward" , "Cause to burst inwards" , "Collapse suddenly inwards" , "Violently collapse inwards" .)