Crossword Genius

No-one can rule pub out, it's impossible to say (15)

Ross

I believe the answer is:

unpronounceable

'impossible to say' is the definition.
(I've seen this before)

'no-one can rule pub out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'no'+'one'+'can'+'rule'+'pub'='noonecanrulepub'
'noonecanrulepub' is an anagram of 'UNPRONOUNCEABLE'.

'it's' is the link.

(Another definition for unpronounceable that I've seen is " Impossible to say properly".)

I've seen this clue in The Telegraph.
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