Iron structure in sunset horribly hot inside (6,3)
I believe the answer is:
nissen hut
'iron structure' is the definition.
'Nissen hut' can be an answer for 'structure' (Nissen hut is an example). I'm not certain of the 'iron' bit.
'in sunset horribly hot inside' is the wordplay.
'horribly' indicates anagramming the letters (a horribly wrong version of the letters).
'hot' becomes 'h' (abbreviation, eg on taps).
'inside' is an insertion indicator.
'in'+'sunset'='insunset'
'insunset' anagrammed gives 'nissenut'.
'nissenut' placed around 'h' is 'NISSEN HUT'.
Can you help me to learn more?
(Other definitions for nissen hut that I've seen before include "Simple building" , "Corrugated iron construction" , "spartan accommodation?" , "metal shelter" , "Military shelter made of corrugated steel" .)