Force crane to collapse in country (6)
I believe the answer is:
france
'country' is the definition.
(France is an example)
'force crane to collapse in' is the wordplay.
'force' becomes 'f' (symbol used in Physics e.g. f=ma).
'to collapse' indicates an anagram.
'in' means one lot of letters goes inside another.
'crane' anagrammed gives 'rance'.
'f' put into 'rance' is 'FRANCE'.
(Other definitions for france that I've seen before include "Part of Europe" , "[NAPOLEON] 's place" , "Can ref travel badly here?" , "Can ref come from here?" , "Nice country!" .)