Trick? Scot's bowled over (4)
I believe the answer is:
scam
'trick?' is the definition.
(I've seen this in other clues)
'scot's bowled over' is the wordplay.
'scot's' becomes 'mac's' (many Scottish surnames begin with Mac).
'bowled over' is a reversal indicator.
'macs' backwards is 'SCAM'.
(Other definitions for scam that I've seen before include "Screw" , "Fraudulent scheme, swindle" , "Swindle (Slang)" , "'A con, deception (4)'" , "rook" .)