Crossword Genius

Pipe, not without content that’s free-flowing (6)

Ross

I believe the answer is:

fluent

'free-flowing' is the definition.
(I've seen this before)

'pipe not without content' is the wordplay.
'pipe' becomes 'flue' (flue pipe is a kind of pipe).
'without content' means to remove the middle letters.
'not' with its centre removed is 'nt'.
'flue'+'nt'='FLUENT'

'that's' is the link.

(Other definitions for fluent that I've seen before include "Expert in tongue" , "Easy, rapid (speech)" , "Easy with words" , "Speaking with facility" , "Ready in speech" .)

I've seen this clue in The Times.
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