Crossword Genius

Irrational: a very loud English Trot going nowhere! (6)

Ross

I believe the answer is:

piaffe

'trot going nowhere' is the definition.
(type of horse trot)

'irrational a very loud english' is the wordplay.
'irrational' becomes 'pi' (an irrational number).
'very loud' becomes 'ff' (musical abbreviation).
'english' becomes 'e' (abbreviation).
'pi'+'a'+'ff'+'e'='PIAFFE'

(Another definition for piaffe that I've seen is " Make slow progress riding".)

I've seen this clue in The Times.
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