Caught by tabloid's bluff (4)
I believe the answer is:
Here is my best explanation:
'bluff' is the definition.
'caught by tabloid's' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'by' means one lot of letters go next to another.
'tabloid' becomes 'rag' ('rag' can be a synonym of 'tabloid').