Old Jack’s contribution to the cricket championship (5)

I believe the answer is:

ketch

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'old jack's' is the definition.
'ketch' can be an answer for 'jack's' (I've seen this before). I'm not certain of the 'old' bit.

'contribution to the cricket championship' is the wordplay.
'contribution to' indicates the answer is hidden within the clue.
'KETCH' is hidden in the letters of 'the cricket championship'.

Can you help me to learn more?

(Other definitions for ketch that I've seen before include "Small two-master sailing vessel" , "Two-masted sailing ship" , "Small sailing vessel with two masts" , "Two-masted sailing vessel" , "Two-masted sailing boat" .)

I've seen this clue in the Evening Standard.

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