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Infiltrate
a
couple’s
enthralling
exchange
at
last
(8)
Infiltrate a couple’s enthralling exchange at last (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Infiltrate. The wordplay starts with PER meaning "a" (as in "once per day" = "once a day"), then MATE meaning "to couple" which contains ("enthralling") the letter E, the last letter of "exchange" ("at last"). MATE wrapping E gives us M-E-ATE, but more precisely: PER + M(E)ATE. Putting it all together: PER + MEATE = PERMEATE.