Guys without mike sing moving number and start to shake banners (7)
I believe the answer is:
ensigns
'banners' is the definition.
(I've seen this in another clue)
'guys without mike sing moving number' is the wordplay.
'guys' becomes 'men' (guy can mean a man).
'without' is a deletion indicator.
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'moving' indicates anagramming the letters (letters are moved around).
'number' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'men' with 'm' taken away is 'en'.
'sing' anagrammed gives 'sign'.
'en'+'sign'+'s'='ENSIGNS'
'and start to shake' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for ensigns that I've seen before include "Flag" , "Sensing (anag)" , "hauled up on deck?" , "officers? Of lower rank" , "US naval officers" .)