Not the first to change roles (5)

I believe the answer is:

loser

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

'not the first' is the definition.
I can't tell whether this definition defines the answer.

'change roles' is the wordplay.
'change' indicates an anagram.
'roles' is an anagram of 'LOSER'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for loser that I've seen before include "A failure, also-ran" , "Unsuccessful person" , "Generally inept" , "One vanquished" , "No-hoper" .)

I've seen this clue in The Globe and Mail.

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