Crossword Genius

Most flexible engineering with pipes (9)

Ross

I believe the answer is:

whippiest

'most flexible' is the definition.
(whippy means springy or flexible)

'engineering with pipes' is the wordplay.
'engineering' indicates anagramming the letters (letters manipulated or engineered).
'with'+'pipes'='withpipes'
'withpipes' with letters rearranged gives 'WHIPPIEST'.

I've seen this clue in The Times.
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