Encourage, say, good (3)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
egg
'encourage' is the definition.
'say good' is the wordplay.
'say' becomes 'eg'.
'good' becomes 'g' (abbreviation).
'eg'+'g'='EGG'
(Other definitions for egg that I've seen before include "Food from a hen" , "The advertising slogan exhorted us to go to work on one" , "Breakfast food, perhaps" , "Item with a yolk" , "Good, boiled, yoke or head" .)