4 down
What
you
are
doing
is
very
caring,
nothing
omitted
(7)
What you are doing is very caring, nothing omitted (7)
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The definition is at the beginning of the clue.
How the clue works
Right, so what you are doing right now is the definition — you're solving the crossword. For the wordplay, take SO (meaning "very") and stick it in front of LOVING (that's "caring"), but whip out the O ("nothing") first, so LOVING becomes LVING — glue those together and you've got your answer.