Trap meant to be sprung in flat (9)
I believe the answer is:
apartment
'flat' is the definition.
(I know that flat can be written as apartment)
'trap meant to be sprung' is the wordplay.
'to be sprung' is an anagram indicator.
'trap'+'meant'='trapmeant'
'trapmeant' with letters rearranged gives 'APARTMENT'.
'in' is the link.
(Other definitions for apartment that I've seen before include "Suite of rooms to live in" , "quarters" , "Flat (mainly US)" , "pad" , "Flat (chiefly US)" .)