Crossword Genius

Holds and locks in this fit youngster with nothing (6)

Ross

I believe the answer is:

aikido

'holds and locks in this' is the definition.
(form of self-defence using holds and locks)

'fit youngster with nothing' is the wordplay.
'fit' becomes 'AI' (resembles Ak, old-fashioned slang for very good).
'youngster' becomes 'kid' (synonyms).
'with' says to put letters next to each other.
'nothing' becomes 'O' (O resembles 0).
'ai'+'kid'+'o'='AIKIDO'

(Other definitions for aikido that I've seen before include "a particular form of art" , "Japanese martial art similar to judo" , "Defensive moves" , "Martial art, akin to judo" , "one of the martial arts" .)

I've seen this clue in The Independent.
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