Crosby heading off in jet, fit for his performance (8)

I believe the answer is:

singable

'fit for his performance' is the definition.
(able to be sung)

'crosby heading off in jet' is the wordplay.
'crosby' becomes 'bing' (singer Bing Crosby).
'heading off' means to remove the first letter.
'in' means one lot of letters goes inside another.
'jet' becomes 'sable' (both can mean a black colour).
'bing' with its initial letter removed is 'ing'.
'ing' inserted inside 'sable' is 'SINGABLE'.

(Another definition for singable that I've seen is " Very tuneful".)

I've seen this clue in The Guardian.

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