Advisor who's not welcome to dine in rugby players' club (14)

I believe the answer is:

backseatdriver

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'advisor who's not welcome' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'dine in rugby players' club' is the wordplay.
'dine' becomes 'eat' (I've seen this before).
'in' means one lot of letters goes inside another.
'rugby players'' becomes 'backs' (back is a type of rugby player).
'club' becomes 'driver' (type of golf club).
'backs'+'driver'='backsdriver'
'eat' put within 'backsdriver' is 'BACKSEATDRIVER'.

'to' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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