Transfer the cornerman (6)

I believe the answer is:

second

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

'transfer' is the definition.
(I know that second is a type of transfer)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for second that I've seen before include "Subordinate; moment" , "Silver medal position" , "taking silver back" , "Runner-up; short time" , "Back-up; short time" .)

I've seen this clue in The Irish Independent.

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