Crossword Genius

To work out, I’d bend muscles at regular intervals (6)

Ross

I believe the answer is:

deduce

'to work out' is the definition.
(thesaurus)

'i'd bend muscles at regular intervals' is the wordplay.
'at regular intervals' indicates alternate letters.
'id'+'bend'+'muscles'='idbendmuscles'
The alternate letters of 'idbendmuscles' are 'DEDUCE'.

(Other definitions for deduce that I've seen before include "Draw conclusion" , "Reason through logic" , "Infer from the evidence" , "Infer by reasoning" , "Draw conclusions" .)

I've seen this clue in The Times.
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