A command for dogs to bite bishop is surprise (6)
I believe the answer is:
ambush
'is surprise' is the definition.
(thesaurus)
'a command for dogs to bite bishop' is the wordplay.
'command for' becomes 'mush' (I am not sure about this - if you are sure you should believe this answer much more).
'dogs' means one lot of letters go next to another (dogs can mean follows or chases).
'to bite' is an insertion indicator (to have a bite can mean to consume).
'bishop' becomes 'B' (abbreviation used in chess).
'a'+'mush'='amush'
'amush' placed around 'b' is 'AMBUSH'.
Can you help me to learn more?
(Other definitions for ambush that I've seen before include "An attack launched from hiding" , "Sudden attack" , "Attack from concealed position" , "Lie in wait; trap" , "Take by surprise" .)