Boost sheep chased by young dog (4,2)
I believe the answer is:
ramp up
'boost' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'sheep chased by young dog' is the wordplay.
'sheep' becomes 'ram' (male sheep).
'chased by' is a charade indicator (letters next to each other) (some letters chase after others).
'young dog' becomes 'pup' (short for puppy).
'ram'+'pup'='RAMP UP'
Can you help me to learn more?
(Other definitions for ramp up that I've seen before include "Artificially inflate" , "Add" .)