Unprotected attacker gets wingman (4)

I believe the answer is:

aide

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'wingman' is the definition.
I can't judge whether this definition defines the answer.

'unprotected attacker' is the wordplay.
'unprotected' says to take the centre.
'attacker' becomes 'raider' (I've seen this before).
The middle of 'raider' is 'AIDE'.

'gets' acts as a link.

Can you help me to learn more?

(Other definitions for aide that I've seen before include "Officer's assistant" , "Adviser or assistant" , "Military officer acting as assistant" , "Leader's assistant" , "Second" .)

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