5 across
A
parting
bicycle
travelling,
getting
away
from
relations
(8)
A parting bicycle travelling, getting away from relations (8)
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The definition is at the end of the clue.
How the clue works
Getting away from relations is your definition here. "A parting" gives you the letter A making its departure into the wordplay, while "bicycle travelling" signals an anagram of BICYCLE, which scrambles to give you CELIBCY. Slot that parting A into the mix and you've got CELIBACY.