A change of underwear for the cricketer (6,4)

I believe the answer is:

second slip

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

'a change' is the definition.
I know nothing about this answer so I can't tell whether this works.

'of underwear for the cricketer' is the wordplay.
'of underwear' becomes 'second' (I can't justify this - if you can you should believe this answer much more).
'for' means one lot of letters go next to another.
'the cricketer' becomes 'slip' (position in cricket).
'second'+'slip'='SECOND SLIP'

Can you help me to learn more?

Want a hint initially instead of a full solution? Install my app