Answer: ebbing

AnswerCrossword Clue
EBBINGWaning
ebbingdecline
ebbingto flow back
ebbingthe flowing back of the tide as the water returns to the sea
ebbingEBB, to recede (to move back)
ebbingto decline
EBBINGFalling off
EBBINGOn the wane
EBBINGReceding
EBBINGGoing out
EBBINGSadly, Big Ben is on the decline (6)
EBBINGDeclining in power
EBBINGGoing out, as the tide
EBBINGOn the way out
EBBINGIn decline
EBBINGHeading toward empty
EBBINGSubsiding.
EBBINGRunning out.
EBBINGRecessive.
EBBINGReceding.
EBBINGDe-intensifying
EBBINGRefluent
EBBINGBackward flow
EBBINGSubsiding
EBBINGGoing out to sea
EBBINGFalling back
EBBINGFlowing back
EBBINGFading slowly
EBBINGWinding down