Crossword Genius

Exercise system of irrational evening shifts? (7)

Ross

I believe the answer is:

pilates

'exercise system' is the definition.
(pilates is an exercise method)

'irrational evening shifts?' is the wordplay.
'irrational' becomes 'pi' (an irrational number).
'evening shifts?' becomes 'lates'.
'pi'+'lates'='PILATES'

'of' acts as a link.

(Other definitions for pilates that I've seen before include "Exercise system" , "Ali's pet (anag) - exercise regime" , "regime for improved fitness" , "attributed to Biblical procurator?" , "Modern exercise" .)

I've seen this clue in The Times.
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