Crossword Genius

My pet cuckoo is vain (5)

Ross

I believe the answer is:

empty

'vain' is the definition.
(I've seen this before)

'my pet cuckoo' is the wordplay.
'cuckoo' indicates an anagram.
'my'+'pet'='mypet'
'mypet' is an anagram of 'EMPTY'.

'is' acts as a link.

(Other definitions for empty that I've seen before include "Evacuate" , "Unfilled" , "Arabic quarter" , "(Of words) insincere" , "Hollow or vacant" .)

I've seen this clue in The Times.
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