Frightful chap with airs -- I could be hypocritical (9)

'hypocritical' is the definition.
(thesaurus)

'frightful chap with airs i' is the wordplay.
'frightful' indicates anagramming the letters (I've seen this in other clues).
'with' means one lot of letters go next to another.
'airs'+'i'='airsi'
'chap' put after 'airsi' is 'airsichap'.
'airsichap' anagrammed gives 'PHARISAIC'.

'could be' is the link.