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Enters the water straight-armed and possibly said vows well (7-5)

Ross

I believe the answer is:

swallow-dives

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'enters the water straight-armed' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'possibly said vows well' is the wordplay.
'possibly' indicates an anagram.
'said'+'vows'+'well'='saidvowswell'
'saidvowswell' is an anagram of 'SWALLOW-DIVES'.

'and' is the link.

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