18 across
Brief
Encounter
at
start
of
quarantine:
you
said,
‘That’s
horrible,
that
is’
(7)
Brief Encounter at start of quarantine: you said, ‘That’s horrible, that is’ (7)
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The definition is at the beginning of the clue.
How the clue works
The definition is Brief Encounter — a QUICKIE being a short fling. For the wordplay, piece it together as a charade: Q (the start of quarantine) followed by U (a homophone of "you", as signalled by you said), then ICK (that's horrible, that is), and finally IE (i.e., meaning that is).