Second to groom untidy batsmen (4,3)

I believe the answer is:

best man

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

'second' is the definition.
(thesaurus)

'groom untidy batsmen' is the wordplay.
'batsmen' anagrams to 'BEST MAN'.
But, I am unsure how this is indicated.

'to' is the link.

Can you help me to learn more?

(Other definitions for best man that I've seen before include "May he win!" , "Groom's friend" , "Important supporting role at a wedding" , "Bloke participating in match" , "Groom's primary attendant at wedding" .)

I've seen this clue in the Sydney Morning Herald.

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