Flexible sort of ice-covered shoe form (7)
I believe the answer is:
elastic
'flexible' is the definition.
(associated in meaning)
'sort of ice-covered shoe form' is the wordplay.
'sort of' is an anagram indicator.
'covered' means one lot of letters goes inside another.
'shoe form' becomes 'last' (I've seen this in another clue).
'ice' with letters rearranged gives 'eic'.
'eic' placed around 'last' is 'ELASTIC'.
(Other definitions for elastic that I've seen before include "Able to give a bit" , "Like some bands" , "Kind of band" , "Fluid" , "Variable" .)