You have to say god is lazy (4)
I believe the answer is:
idle
'lazy' is the definition.
(similar in meaning)
'you have to say god' is the wordplay.
I cannot quite understand how this works, but
'god' could be 'd' (abbreviation in various Latin phrases) and 'd' is found in the answer.
The remaining letters 'ile' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Other definitions for idle that I've seen before include "Good-for-nothing" , "Inactive - lied (anag)" , "Not used to work" , "Futile" , "Trivial" .)