Trick Chicago airport's pilot officer about cloak (5,4)

'cloak' is the definition.
(opera hood is a kind of cloak)

'trick chicago airport's pilot officer about' is the wordplay.
'trick' becomes 'do' (I've seen this in other clues).
'chicago airport' becomes 'ohare' (I've seen this before).
'pilot officer' becomes 'po' (short for pilot officer).
'about' says the letters should be written in reverse.
'do'+'ohare'+'po'='dooharepo'
'dooharepo' reversed gives 'OPERA HOOD'.