Roasting meat, taking a bite (10)
I believe the answer is:
lambasting
'roasting' is the definition.
Although both the answer and definition are present participle verbs, I cannot see how they can define each other.
'meat taking a bite' is the wordplay.
'meat' becomes 'lamb' (lamb is a type of meat).
'taking' says to put letters next to each other.
'bite' becomes 'sting' (synonyms).
'lamb'+'a'+'sting'='LAMBASTING'
Can you help me to learn more?
(Another definition for lambasting that I've seen is " Censuring".)