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Essentially
stretches
to
exercise
(5)
Essentially stretches to exercise (5)
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The definition is at the end of the clue.
How the clue works
The definition is exercise, meaning TRAIN. The word TRAIN is hidden inside "sTRAINs" — the word "stretches" literally contains the answer. The indicator "essentially" suggests we look at the core letters within "stretches", revealing TRAIN.