Officer caught wearing little jumper that's ornate (6)
I believe the answer is:
rococo
'ornate' is the definition.
(I've seen this in another clue)
'officer caught wearing little jumper' is the wordplay.
'officer' becomes 'co' (Commanding Officer abbreviation).
'caught' becomes 'c' (cricket abbreviation).
'wearing' indicates putting letters inside.
'little jumper' becomes 'roo' (short for kangaroo, something which jumps).
'co'+'c'='coc'
'coc' put into 'roo' is 'ROCOCO'.
'that's' acts as a link.
(Other definitions for rococo that I've seen before include "Delicate architectural style from 18th-century France" , "Late Baroque artistic style" , "Highly ornamented" , "Elaborate baroque style of ornamentation" , "Extravagant in style" .)