Exercise regime in which one must break crockery (7)
I believe the answer is:
pilates
'exercise regime' is the definition.
(I've seen this before)
'one must break crockery' is the wordplay.
I cannot really see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'crockery' could be 'plate' (plate is a kind of crockery) and 'plate' is found within the remaining letters.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'in which' acts as a link.
Can you help me to learn more?
(Other definitions for pilates that I've seen before include "Pleats I arrange into a form of exercise" , "Set of exercises used in holistic medicine" , "discipline?" , "Ali's pet (anag) - exercise regime" , "Exercise system" .)