Power made yacht's movements erratic (6)

I believe the answer is:

patchy

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'erratic' is the definition.
(thesaurus)

'power made yacht's' is the wordplay.
'power' becomes 'p' (symbol in physics).
'made' is an anagram indicator.
'yacht' with letters rearranged gives 'atchy'.
'p'+'atchy'='PATCHY'

'movements' 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 patchy that I've seen before include "Inconsistent" , "Irregular or uneven" , "Uneven in quality; showing signs of repair" , "Morose" , "Often repaired" .)

I've seen this clue in the Sydney Morning Herald.

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