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Wife
and
artist
keeping
pea,
essentially,
in
pod
(6)
Wife and artist keeping pea, essentially, in pod (6)
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The definition is at the end of the clue.
How the clue works
Look at pod at the end — that's your definition, a pod being a group of whales. You've got W for wife, then HALS (the artist Frans Hals) keeping hold of E, the middle letter — the essential bit — of 'pea', giving you HAL-E-S. String it all together and W plus HALES does the job nicely.