Crossword Genius

White House club wary of far-off guarded response to ambitions (2,7,4,3,4,3)

Ross

I believe the answer is:

be careful what you wish for

I'm a little stuck... Click here to teach me more about this clue!

'ambitions' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'white house club wary of far-off guarded response to' is the wordplay.
I cannot really understand how this works, but
'white' could be 'w' and 'w' is present in the answer.
'house' could be 'h' and 'h' is found within the answer.
'club' could be 'y' (YMCA or YWCA commonly shortened) and 'y' is located in the answer.
'wary' could be 'careful' (similar in meaning) and 'careful' is found in the answer.
'of' could be 'o' and 'o' is found within the answer.
'to' could be 'for' and 'for' is found in the answer.
This explanation may well be incorrect...

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I've seen this clue in The Guardian.
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