11 across
Perception
absolutely
possessed
by
rowing
crew
(8)
Perception absolutely possessed by rowing crew (8)
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The definition is at the beginning of the clue.
How the clue works
Right, so Perception is your definition there, pointing to sight or the ability to see. For the wordplay, take YES as your word for "absolutely" and stick it inside EIGHT, which is the rowing crew — so you're slotting YES into the middle of EIGHT to get E-YES-IGHT.