Type of window in small attic extension (7)

I believe the answer is:

lattice

I'm a little stuck... Click here to teach me more about this clue!

'type of window' is the definition.
'lattice' can be an answer for 'window' (type of window). I am unsure of the 'type of' bit.

'in small attic extension' is the wordplay.
'in' says the answer is hidden in the clue.
'LATTICE' can be found hidden inside 'small attic extension'.

Can you help me to learn more?

(Other definitions for lattice that I've seen before include "Trellis: maybe" , "Ornamental framework" , "Arrangement with bars" , "Regular open structure" , "type of tracery" .)

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