Favourites look furtively back to see what marching band must do? (4,4)
I believe the answer is:
keep step
'see what marching band must do?' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'favourites look furtively back' is the wordplay.
'favourites' becomes 'pets' ('pet' can be a synonym of 'favourite').
'look furtively' becomes 'peek' (I've seen this in another clue).
'back' says the letters should be written in reverse.
'pets'+'peek'='petspeek'
'petspeek' back-to-front is 'KEEP STEP'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for keep step that I've seen before include "maintain conformity" , "conform" .)