Crossword Genius

All by myself and, oh, need to get jiggy! (3-6)

Ross

I believe the answer is:

one-handed

'all by myself' is the definition.
(one-handed can mean involving only one person)

'and oh need to get jiggy' is the wordplay.
'to get jiggy' indicates an anagram (letters jig or dance around).
'and'+'oh'+'need'='andohneed'
'andohneed' anagrammed gives 'ONE-HANDED'.

(Other definitions for one-handed that I've seen before include "very short of staff?", "Not fully getting to grips with things".)

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