Flag new soldiers raised amid extremes of emotion (6)
I believe the answer is:
ensign
'flag' is the definition.
(I know that ensign is a type of colors)
'new soldiers raised amid extremes of emotion' is the wordplay.
'new' becomes 'n' (abbreviation as in New Testament NT).
'soldiers' becomes 'gis' (GI is an informal term for a US soldier).
'raised' says the letters should be written backwards (going up in a down clue).
'amid' indicates putting letters inside.
'extremes of' means to remove the middle letters (only the letters at the extremes of the word).
'emotion' with its centre removed is 'en'.
'gis' reversed gives 'sig'.
'n'+'sig'='nsig'
'nsig' inserted within 'en' is 'ENSIGN'.
(Other definitions for ensign that I've seen before include "SECOND PART OF 10" , "Badge, flag" , "Ship's colours" , "Junior US naval officer" , "In British infantry, a colours bearer" .)