My word is for ever (1,3)
I believe the answer is:
i say
'my word' is the definition.
'is for ever' is the wordplay.
I cannot quite understand how this works, but
'is' is found in the answer.
The remaining letters 'ay' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for i say that I've seen before include "That is surprising!" , "Blimey!" , "Comment from protestor" , "Look here; oh, my" , "Gosh!" .)