Keep on pushing King forward? A sensitive point (5-3)

I believe the answer is:

nerve-end

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'keep on pushing king forward? a' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'sensitive point' is the wordplay.
'sensitive' becomes 'nerve' (I can't justify this - if you can you should give a lot more credence to this answer).
'point' becomes 'end' (end point is a kind of point).
'nerve'+'end'='NERVE-END'

Can you help me to learn more?

I've seen this clue in The Independent.

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