Want to turn the key to enter the home (4)
I believe the answer is:
need
'want' is the definition.
('need' can be a synonym of 'want')
'turn the key to enter the home' is the wordplay.
'turn' says the letters should be written in reverse.
'the key' becomes 'd' (I've seen this in other clues).
'to enter the home' becomes 'een' (I can't explain this - if you can you should give a lot more credence to this answer).
'd'+'een'='deen'
'deen' backwards is 'NEED'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for need that I've seen before include "Rely on" , "destitute state" , "Cry out for - prerequisite" , "Lack - demand" , "Want - require(ment)" .)