Crossword Genius

Competitive karaoke on vacation with nurse (4)

Ross

I believe the answer is:

keen

I'm a little stuck... Click here to teach me more about this clue!

'competitive' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'karaoke on vacation with nurse' is the wordplay.
'on vacation' means to remove the middle letters.
'with' is a charade indicator (letters next to each other).
'nurse' becomes 'en' (abbreviation for enrolled nurse).
'karaoke' with its middle removed is 'ke'.
'ke'+'en'='KEEN'

Can you help me to learn more?

(Other definitions for keen that I've seen before include "Fervent" , "Longing" , "Quick" , "Eager - to lament the dead" , "mourn for the departed" .)

I've seen this clue in The Telegraph.
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