Defenders scoff — club know-all offering unsolicited directions (8,6)

I believe the answer is:

backseat driver

'know-all offering unsolicited directions' is the definition.
(someone giving unwanted advice)

'defenders scoff club' is the wordplay.
'defenders' becomes 'backs' (I've seen this before).
'scoff' becomes 'eat' (I've seen this before).
'club' becomes 'driver' (type of golf club).
'backs'+'eat'+'driver'='BACKSEAT DRIVER'

(Another definition for backseat driver that I've seen is " Meddling passenger".)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.