Where to change hair - or more after refreshment?

I believe the answer is:

lockerroom

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'where to change' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'hair or more after refreshment?' is the wordplay.
'hair' becomes 'lock' (lock is a kind of hair).
'after' means one lot of letters go next to another.
'refreshment?' indicates an anagram (I've seen 'refreshment' mean this).
'or'+'more'='ormore'
'ormore' with letters rearranged gives 'erroom'.
'lock'+'erroom'='LOCKER-ROOM'

Can you help me to learn more?

I've seen this clue in The Daily Mail.

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