When darkness is coming in ironwork? (7)
I believe the answer is:
evening
This clue is a double definition.
'when darkness is coming in' is the first definition.
(it gets dark in the evening)
'ironwork?' is the second definition.
(an iron might be used to even out creases)
(Other definitions for evening that I've seen before include "Making uniform" , "The close of a day; a word used in the first ever 2 dn" , "Subject of nocturne" , "Time of falling light" , "Hours before bedtime" .)