Aspirations to accommodate sailors with very good instruments (9)

I believe the answer is:

hornpipes

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'instruments' is the definition.
(I know this)

'aspirations to accommodate sailors with very good' is the wordplay.
'aspirations' becomes 'hopes' (I've seen this before).
'to accommodate' means one lot of letters goes inside another.
'sailors with' becomes 'rn' (I can't explain this - if you can you should believe this answer much more).
'very good' becomes 'pi' (I've seen this in other clues).
'rn'+'pi'='rnpi'
'hopes' enclosing 'rnpi' is 'HORNPIPES'.

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I've seen this clue in The Telegraph.

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