Officers sensing change (7)
I believe the answer is:
ensigns
'officers' is the definition.
(I've seen this before)
'sensing change' is the wordplay.
'change' indicates anagramming the letters.
'sensing' with letters rearranged gives 'ENSIGNS'.
(Other definitions for ensigns that I've seen before include "(Military) flags" , "Sensing (anag)" , "standards" , "officers? Of lower rank" , "US naval officers" .)