Bishop doing cow impressions excited to be going viral, perhaps (7,2)
I believe the answer is:
blowing up
'bishop doing' is the definition.
Although both the answer and definition are present participle verbs, I don't see how they can define each other.
'cow impressions excited to be going viral perhaps' is the wordplay.
I cannot really see how this works, but
'excited' could be 'up' and 'up' is present in the answer.
'going' could be 'blowing' (blowing is a kind of going) and 'blowing' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for blowing up that I've seen before include "reducing (to rubble)?" , "Exploding" , "Enlarging" .)