Officer giving suggestion to senior officer’s group (8)
I believe the answer is:
tipstaff
'officer' is the definition.
(I've seen this before)
'giving suggestion to senior officer's group' is the wordplay.
'giving' says to put letters next to each other.
'suggestion' becomes 'tip' (tip is a kind of suggestion).
'to senior officer's group' becomes 'staff' (I am not sure about this - if you are sure you should believe this answer much more).
'tip' next to 'staff' is 'TIPSTAFF'.
Can you help me to learn more?
(Other definitions for tipstaff that I've seen before include "Court official" , "Old officer" , "One authorised" , "Pat's tiff with the judge" , "Bailiff" .)