House and home one is to illustrate after retirement (6)
I believe the answer is:
gemini
'house' is the definition.
(each star sign has an astrological house)
'home one is to illustrate after retirement' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'one is' becomes 'I'm' ('one is' can formally or humorously mean 'I am').
'to illustrate' becomes 'eg' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'after retirement' says the letters should be written backwards.
'in'+'im'+'eg'='inimeg'
'inimeg' back-to-front is 'GEMINI'.
'and' is the link.
Can you help me to learn more?
(Other definitions for gemini that I've seen before include "Zodiacal twins" , "star group" , "Castor and Pollux constellation" , "Twins star-sign" , "Heavenly sign of the Twins" .)