Model women the writer lands in periods of decay? (9)

'periods of decay?' is the definition.
The definition and answer can be both related to time as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'model women the writer lands' is the wordplay.
'model' indicates anagramming the letters (the solver must model the letters into a new form).
'women' becomes 'w' (standard abbreviation).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'writer' becomes 'I' (the person who is writing these clues).
'lands' becomes 'lights' (lighting is a kind of landing).
'w'+'t'+'i'='wti'
'wti' is an anagram of 'twi'.
'twi'+'lights'='TWILIGHTS'

'in' acts as a link.

Can you help me to learn more?