Will get one back into shape? Go on! (8)

I believe the answer is:

continue

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'go on' is the definition.
(synonyms)

'will get one back into' is the wordplay.
'will get' becomes 'cone' (I can't explain this - if you can you should believe this answer much more).
'one' becomes 'unit' (synonyms).
'back' says the letters should be written backwards.
'into' is an insertion indicator.
'unit' back-to-front is 'tinu'.
'cone' placed around 'tinu' is 'CONTINUE'.

'shape?' is the link.
I am not very happy about this link. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for continue that I've seen before include "Proceed" , "Persist" , "Carry on" , "Don't stop, keep going" , "Go on without stopping" .)

I've seen this clue in the Evening Standard.

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