Some latticework in room (5)
I believe the answer is:
attic
'room' is the definition.
(I've seen this before)
'some latticework in' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'ATTIC' is hidden in the letters of 'latticework in'.
(Other definitions for attic that I've seen before include "from Greece" , "of Greek region" , "Dusty room" , "cockloft" , "Tacit (anag.)" .)