She takes a month to get a 1st class return (5)
I believe the answer is:
maria
'she' is the definition.
'a month to get a 1st class return' is the wordplay.
'month' becomes 'M' (standard abbreviation).
'to get' says to put letters next to each other.
'a ast class' becomes 'air' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'return' says the letters should be written backwards.
'a'+'m'='am'
'am' after 'air' is 'airam'.
'airam' backwards is 'MARIA'.
'takes' is the link.
Can you help me to learn more?
(Other definitions for maria that I've seen before include "Italian Mary" , "Black --, -- Theresa" , "Lunar plains; girl's name" , "Black --, police van" , "(Of plant) become limp" .)