He's on the radio in The Life of Riley (4)
I believe the answer is:
ease
'life of riley' is the definition.
(I've seen this in another clue)
'he's on the radio in' is the wordplay.
'he' becomes 'Ase'.
'on' means one lot of letters go next to another.
'the radio in' becomes 'e' (I can't explain this - if you can you should give a lot more credence to this answer).
'ase' put after 'e' is 'EASE'.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for ease that I've seen before include "Absence of hardship" , "Make less hard" , "State of relaxation or rest" , "Lack of worry or agitation" , "Become less severe; facilitate" .)