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Refusal sent back twice, before sweetheart planted this unaided? (2,4,3)

Ross

I believe the answer is:

on ones own

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

'unaided?' is the definition.

'refusal sent back twice before sweetheart planted' is the wordplay.
I cannot quite see how this works, but
'refusal' could be 'no' (saying no to something) and 'no' is found within the answer.
'sweetheart' could be 'e' (the heart/centre of 'sweet') and 'e' is located in the answer.
'planted' could be 'sown' (similar in meaning) and 'sown' is located in the answer.
The remaining letters 'on' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'this' is the link.

Can you help me to learn more?

(Other definitions for on ones own that I've seen before include "Independently" , "Alone" , "Helpless" .)

I've seen this clue in The Irish Times.
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