Gosh - a nobleman! (4)

I believe the answer is:

lord

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

'nobleman' is the definition.
(I know that nobleman can be written as Lord)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lord that I've seen before include "Feudal superior" , "Noble title" , "Member of Upper House" , "Leader of the 'Six Hundred'" , "Dismayed expression; ruler" .)

I've seen this clue in the Evening Standard.

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