Deception about passion (5)
I believe the answer is:
cheat
'deception' is the definition.
(cheat is a kind of deception)
'about passion' is the wordplay.
'about' becomes 'c' (abbreviation for 'circa').
'passion' becomes 'heat' ('heat' can be a synonym of 'passion'**).
'c'+'heat'='CHEAT'
(Other definitions for cheat that I've seen before include "Play false" , "Teach? (Anag)" , "Deceitful person" , "Fool" , "Welsh" .)