Crossword Genius

A poser for one who can't put on a dress tie? (6,7)

Ross

I believe the answer is:

knotty problem

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'can't put on a dress tie?' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'a poser for one who' is the wordplay.
'a poser' becomes 'problem' (I've seen this before).
'for' means one lot of letters go next to another (I've seen this in other clues).
'one who' becomes 'knotty' (I am not sure about this - if you are sure you should believe this answer much more).
'problem' put after 'knotty' is 'KNOTTY PROBLEM'.

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I've seen this clue in The Globe and Mail.
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